Oh, I love those nights when you walk in the door completely drained, but you still need something warm, hearty, and actually healthy on the table in under 30 minutes. That, my friends, is when my Instant Pot comes out to save the day! Forget soaking lentils overnight—this Instant Pot Tomato Lentil Soup is pure magic because it uses red lentils, which practically dissolve into velvety goodness under pressure. Seriously, this recipe has rescued me more times than I can count when the dinner plan went completely out the window. It’s packed with simple pantry staples, so you probably have everything you need right now to whip up the best, richest, one-pot comfort soup you’ve ever tasted. You won’t believe how easy this is!
Why This Instant Pot Tomato Lentil Soup Works So Well
Honestly, I used to dread making lentil soup because it meant simmering stuff on the stove for what felt like three hours just to get those lentils tender. But the Instant Pot changed everything! This recipe is designed to be ridiculously fast, which is why I call it my go-to for a quick tomato lentil soup. We’re talking about serving a complete, healthy, satisfying meal that tastes like it simmered all day, but it’s officially done in about 30 minutes total time.
And let’s talk about cleanup—or the lack thereof! Because this is a true one-pot wonder, you just need to wash the inner pot and maybe a cutting board. That’s it! This makes it such an easy pressure cooker lentil soup that even if you’re a beginner with your new appliance, you can nail this perfectly on the first try. It’s the definition of an efficient weeknight hero.
Speed and Flavor Development in the Pressure Cooker
The magic happens because of two things: the red lentils and the pressure. Red lentils are my absolute favorite for speed because they break down beautifully when cooked under high heat. They don’t just get soft; they actually lend their natural starches to the broth, making the soup naturally thick and almost creamy without me having to add any heavy cream or dairy. Wow!
The sealing environment of the pressure cooker locks in all those aromatic herbs—the thyme and the oregano—and forces that flavor deep into the tomatoes and lentils right away. Instead of developing flavor over hours, the pressure cooker concentrates it in minutes. If you’ve ever tried my stovetop vegetable minestrone, you know I love depth, and this machine gets there faster than anything else I own.
Ingredients for the Best Instant Pot Tomato Lentil Soup
Okay, listen up, because the beauty of this Instant Pot tomato lentil soup lies in how common these ingredients are! I love that I can usually make this recipe when I think I have nothing planned. It relies on simple, sturdy pantry items, which is why it’s always ready when I need it. Remember, accuracy matters here, especially with the lentils, so trust the measurements!
- 1 tablespoon olive oil
- 1 medium yellow onion, chopped
- 2 carrots, chopped
- 2 celery stalks, chopped
- 3 cloves garlic, minced
- 1 teaspoon dried oregano
- 1/2 teaspoon dried thyme
- 1/4 teaspoon red pepper flakes (optional, but I always sneak them in!)
- 1 cup red lentils, rinsed
- 1 (28 ounce) can crushed tomatoes
- 6 cups vegetable broth
- 1 bay leaf
- 1 teaspoon salt (or to taste, we adjust this at the end!)
- 1/2 teaspoon black pepper
- 1 tablespoon lemon juice (for the finish, don’t skip this!)
Ingredient Notes and Potential Substitutions
My number one rule for this soup is buying red lentils. Don’t substitute brown or green lentils here unless you’re prepared to change the cook time entirely! Red lentils are soft and break down perfectly in the short 10-minute pressure cycle, giving you that signature texture. If you use brown or green, you’d need closer to 18 or 20 minutes on High pressure, and that’s just more time than I want to spend staring at my appliance!
If you’re out of vegetable broth? No sweat. You can absolutely use water if you substitute with three to four vegetable bouillon cubes or concentrate. Just make sure you are boosting the salt slightly to keep the flavor from falling flat. And if you are making this for little kids or people sensitive to heat, just leave out the red pepper flakes entirely. You still get that great savory base from the oregano and thyme, I promise.
If you are looking for other ways to use up lentils, check out my recipe for vegan lentil loaf! It’s surprisingly good!
Step-by-Step Guide to Making Instant Pot Tomato Lentil Soup
This is where the magic happens! You’re going to be shocked at how little hands-on time this takes, which is why this is such a great one for those brand-new to pressure cooking. If you can turn your Instant Pot on, you can manage this entire beginner Instant Pot recipe without breaking a sweat. Remember to rinse your lentils first—it’s a small step but it keeps the soup from getting too foamy when it cooks under pressure.
Sautéing Aromatics for Depth of Flavor
First thing’s first: you need to wake up those veggies! Set your machine to the Sauté function—Medium is usually perfect for this. Drizzle in the olive oil, and once it shimmers slightly, toss in your onion, the chopped carrots, and the celery. We want these to soften up and get a little sweetness going, so let them hang out there for about five minutes. Don’t overcrowd the bottom! You want them to caramelize a bit, not steam themselves to mush.
Next up, toss in your minced garlic, the dried oregano, thyme, and those optional red pepper flakes. You only want to cook this mixture for about 60 seconds—just until you start smelling that beautiful garlic perfume! As soon as you smell it, get ready—you must hit the ‘Cancel’ button immediately. If you leave the Sauté function running, the little bits of garlic clinging to the bottom will burn while we pressure cook, and you’ll get that awful “BURN” warning, which nobody wants to deal with. Oops!
Pressure Cooking the Instant Pot Lentil Soup Recipe
Now we’re transitioning into the main event. After scratching up any stuck brown bits from the bottom, dump in your rinsed red lentils, pour in the entire can of crushed tomatoes, and top it all off with the vegetable broth and that single bay leaf. Give everything a gentle stir to make sure nothing is sticking to the very bottom, which is crucial for pressure cooking!
Secure that lid tightly, make sure the vent valve is clicked firmly into the Sealing position, and set the timer. I run this on Manual or Pressure Cook setting, set to High pressure, for exactly 10 minutes. That’s it! This short time is exactly what you need to turn those dry red lentils into perfectly tender little flavor bombs without them turning into complete mush. I just let it run and walk away!
Releasing Pressure and Finishing Touches
This next part is key to getting the ideal texture in our quick tomato lentil soup. Once the 10 minutes are up, you need to let it sit for a full 10 minutes before touching the valve. This is called a Natural Pressure Release (NPR), and it lets the pressure slowly drop. Why do we wait? If we Quick Release (QR) immediately, the boiling hot liquid tends to spit out of the steam vent, making a huge mess and sometimes overcooking the very top layer of the soup.
After that 10-minute wait, you can carefully switch the valve to Venting to let out the remaining wisps of steam. Safety first always! Pop the lid off, fish out that sad-looking bay leaf (we don’t eat those, remember?), and stir in your salt, pepper, and that splash of lemon juice. That lemon juice is my secret weapon; it brightens up the whole dish! If you want a thicker result, take your immersion blender and pulse it just a few times—don’t make it totally smooth! Partial blending gives you a luxurious texture without losing all the visible vegetables. This is how we get that wonderful, hearty, vegan Instant Pot soup texture.
Tips for the Perfect Creamy Lentil Soup without Dairy
Since this recipe is totally vegan—no dairy in sight!—you might worry that the texture won’t be rich enough, right? Wrong! This is where those beautiful red lentils truly earn their keep. They are naturally starchy, and when they break down correctly, they create the luxurious body we look for in a classic comfort soup.
The secret to that satisfying, thick texture relies on two things we already covered: using red lentils specifically (not brown!) and controlling that blending step at the end. If you want that velvety mouthfeel associated with a traditional, dairy-loaded soup, you need to let those starches release their magic. This is how we achieve a gorgeous, naturally creamy lentil soup without dairy.
When you go to blend, remember my rule: LESS IS MORE. If you use your immersion blender for too long, you end up with something that feels closer to thick tomato paste than soup. I pulse it maybe three or four times, just until about half the lentils look broken down. That leaves plenty of whole lentils intact for texture, but the broth itself becomes incredibly smooth. This keeps the soup hearty and ensures your final product remains a fantastic, healthy vegan Instant Pot soup!
Another small trick for enhancing that creaminess is to slightly reduce the liquid during the cooking phase. If you look at the recipe, it calls for 6 cups of broth. If you only use 5 cups, the starches concentrate even more intensely, resulting in a significantly thicker soup when the pressure releases. Just remember that tip from the storage section—if you thicken it too much now, you’ll just add broth back in when you reheat it later!
Serving Suggestions for Your Speedy Savory Soup Meals
We’ve worked hard to get this soup done so fast, so we don’t want to spend an hour assembling sides, right? That defeats the purpose of making such a speedy savory soup meal! Luckily, this tomato lentil soup is so bright and satisfying that it honestly stands up perfectly on its own. But if you want to dress it up just a little bit for company or just because you deserve a real dinner setup, I have a few simple ideas.
First and foremost: bread! You absolutely need something sturdy to mop up every last drop of that savory broth. I love pairing this with a big slab of crusty sourdough, but if you really want to push it over the top, you have to try my rosemary focaccia bread. Dipping that soft, oily bread into the hot, slightly acidic soup? Heaven.
If you are trying to stretch this soup into a fuller meal—maybe for meal prep or feeding a crowd—a small, crisp side salad is perfect. Keep the dressing extremely light, maybe just a very simple vinaigrette with lots of vinegar. The acidity in the salad cuts through the heartiness of the lentils beautifully.
Finally, let’s talk garnishes, because even the simplest soup benefits from a little visual flair. Right before serving, drizzle a tiny swirl of really good quality extra virgin olive oil right on top. It adds a buttery richness without adding actual butter, and it looks gorgeous floating on the red surface. A sprinkle of fresh, chopped parsley or even some fresh basil adds a pop of color and a fresh herbaceous note that lifts the whole flavor profile. A little yogurt or sour cream swirl often makes people happy too, though remember that’s dairy if you’re sticking strictly to vegan!
Storage and Reheating Instructions for Leftover Soup
This is the best part about making a huge batch of soup in the Instant Pot: you get leftovers! Honestly, I think this Instant Pot Tomato Lentil Soup tastes even better the next day once all those herbs have had time to really meld with the tomatoes and lentils. Don’t be shy about making a double batch!
When it comes to storing leftovers, you have two great options. For the fridge, you can keep this soup airtight for about three to four days. I always use wide-mouth jars because they make it easy to access the soup later. If you know you won’t eat it all within four days (which is rare in my house!), this soup freezes like a dream. Pop it into freezer-safe containers, leaving about an inch of space at the top for expansion. It lasts beautifully in the freezer for up to three months.
Now, here is the crucial piece of advice that shows you know what you’re doing when it comes to soup storage: when you reheat it, you HAVE to add a splash more liquid. Seriously, this soup thickens up like crazy overnight! When the starches in those red lentils settle in the fridge, they soak up almost all the available broth.
When I reheat it on the stovetop, I start it on medium-low and immediately pour in about a half-cup of water or extra vegetable broth for every two servings I’m warming up. You’ll stir that in slowly until it reaches that perfect, spoonable consistency again. If you reheat it in the microwave, just stir in a little liquid every minute or so until it loosens up. If you don’t add liquid, you risk ending up with a thick, seasoned lentil mush rather than a silky soup!
It’s comforting, healthy, and holds up wonderfully over time. If you’re looking for inspiration on how to use up leftover soup later in the week, you can always look over my thoughts on how I repurpose leftover holiday minestrone—the same principles apply here!
Frequently Asked Questions About This Recipe
Can I use brown or green lentils instead of red lentils in the Instant Pot Tomato Lentil Soup?
That’s a great question, especially if you’re new to pressure cooking! You absolutely *can* use brown or green lentils, but you must adjust your timing because they are much firmer than the red ones we use here. For brown or green lentils, you’ll want to bump that pressure cook time up to about 15 minutes on High pressure, and then follow it with the full 10-minute Natural Pressure Release. Keep in mind that brown and green lentils won’t break down and give you that incredible natural creaminess that the red lentils do, so you’ll definitely need to do more blending at the end if you want a thick texture!
Is this a naturally vegan Instant Pot soup?
Yes, it totally is! My goal with this recipe was to make something super hearty and satisfying that anyone could enjoy, so as written, it’s completely vegan and I test it that way every time. The only thing you really have to watch out for is the broth. If you use a vegetable broth that has hidden dairy (which is rare but happens!), then it won’t be vegan. But stick to a standard vegetable broth, and you’ve got yourself a fantastic, completely plant-based meal. It’s such a great, simple vegan Instant Pot soup to rely on.
What is the best way to thicken or thin this soup?
This is a common thing people ask about when learning how to make lentil soup in the Instant Pot because the starch release can be unpredictable! To thicken it up, you have two paths: you can either let it sit uncovered on the Sauté setting for 5-10 minutes so some of the liquid evaporates, or you can use that immersion blender, like I mention in the steps, and pulse it a few times to break down some of the lentils into the base. That’s my preferred method because it adds body without overcooking everything!
Now, if you happen to forget to rinse your lentils or you just want it thinner, don’t panic! Just stir in a splash of water or broth when you are reheating it, as I discuss in the storage section. It absorbs liquid really quickly, so just add what you need until it feels right for your ladle!
Nutritional Information Estimate
I always try to keep things healthy when I’m making comfort food this easily! Since we are using pantry staples and relying on whole foods like lentils and vegetables, this is a really nutritious meal you can feel good about serving. It’s loaded with fiber, which keeps you full for hours—definitely better than grabbing takeout!
Here is the estimated breakdown for one serving of this soup, based on the recipe details provided:
- Serving Size: 1.5 cups
- Calories: 280
- Sugar: 8g
- Sodium: 450mg
- Fat: 4g
- Saturated Fat: 0.5g
- Unsaturated Fat: 3.5g
- Trans Fat: 0g
- Carbohydrates: 48g
- Fiber: 15g
- Protein: 18g
- Cholesterol: 0mg
Now, I have to give you the standard disclaimer here because I’m not a certified nutritionist running a commercial kitchen! These numbers are just estimates based on what I typically use. If you swap out vegetable broth for low-sodium broth, or if you use a different brand of canned tomatoes, those sodium and calorie counts might shift a tiny bit. So, treat these figures as a great guideline, but remember they aren’t exact science!
Share Your Instant Pot Success
I truly hope this recipe speeds up your week and brings some great, cozy flavor into your kitchen! Making this soup is so satisfying because it proves you don’t need hours of dedication to create deep, delicious comfort food. Now that you’ve tackled the stovetop steps and figured out the pressure release (which I bet went perfectly!), I would absolutely love to hear about it!
Did you use the immersion blender, or did you leave yours totally rustic? Did you sneak in some extra herbs or spices? Don’t be shy! I really want to know how your batch of Instant Pot Tomato Lentil Soup turned out.
Please take a moment to leave a comment below telling me what you thought. Five stars are the best compliment, obviously, but honest feedback helps other busy home cooks decide if this is their next go-to meal. If you managed to snap a picture of your steaming bowl—maybe with that crusty focaccia I mentioned—please share it with me! You can reach out through the contact page or tag me on social media. Happy cooking, and thanks so much for trying out my favorite speedy soup!
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Instant Pot Tomato Lentil Soup
- Total Time: 30 min
- Yield: 6 servings 1x
- Diet: Vegan
Description
Make a flavorful and hearty tomato lentil soup quickly using your Instant Pot. This recipe uses simple pantry staples and cooks lentils perfectly under pressure.
Ingredients
- 1 tablespoon olive oil
- 1 medium yellow onion, chopped
- 2 carrots, chopped
- 2 celery stalks, chopped
- 3 cloves garlic, minced
- 1 teaspoon dried oregano
- 1/2 teaspoon dried thyme
- 1/4 teaspoon red pepper flakes (optional)
- 1 cup red lentils, rinsed
- 1 (28 ounce) can crushed tomatoes
- 6 cups vegetable broth
- 1 bay leaf
- 1 teaspoon salt (or to taste)
- 1/2 teaspoon black pepper
- 1 tablespoon lemon juice (for finishing)
Instructions
- Set your Instant Pot to the Sauté function. Add olive oil. When hot, add onion, carrots, and celery. Cook until softened, about 5 minutes.
- Add garlic, oregano, thyme, and red pepper flakes. Cook for 1 minute until fragrant. Press ‘Cancel’ to stop sautéing.
- Add the rinsed red lentils, crushed tomatoes, vegetable broth, and bay leaf to the pot. Stir gently to combine.
- Secure the lid and set the vent to Sealing. Select Manual or Pressure Cook on High for 10 minutes.
- When the cooking time finishes, allow a Natural Pressure Release (NPR) for 10 minutes, then carefully switch the valve to Venting to release any remaining pressure.
- Remove and discard the bay leaf. Stir in salt, pepper, and lemon juice. If you prefer a creamier texture, use an immersion blender to partially blend the soup.
- Serve hot.
Notes
- Rinsing the red lentils removes excess starch, which helps prevent foaming during pressure cooking.
- For a thicker soup, reduce the vegetable broth to 5 cups.
- This soup thickens considerably upon standing; add a splash of water or broth when reheating if needed.
- Prep Time: 10 min
- Cook Time: 20 min
- Category: Soup
- Method: Pressure Cooking
- Cuisine: American
Nutrition
- Serving Size: 1.5 cups
- Calories: 280
- Sugar: 8
- Sodium: 450
- Fat: 4
- Saturated Fat: 0.5
- Unsaturated Fat: 3.5
- Trans Fat: 0
- Carbohydrates: 48
- Fiber: 15
- Protein: 18
- Cholesterol: 0
