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The onions should be soft and sweet before the tomatoes go in; rushing that first stretch leaves a sharper edge in every spoonful. I give them the full few minutes in the Dutch oven, then let the tomato paste toast briefly with the garlic and oregano. That small pause makes this high protein tomato soup taste fuller without a long ingredient list.

Red lentils simmer right in the tomato broth, then blend into a smooth, substantial base. Greek yogurt goes in after the pot comes off the heat, so the finished soup stays creamy and tangy instead of tasting heavy. It makes four generous bowls, with a soft tomato aroma and a little brightness from the yogurt in every spoonful.

Red Lentils Give Tomato Soup Its Body Without Cream

A tomato soup can taste full and still feel thin. Here, red lentils solve that problem in the pot rather than relying on cream or a separate thickener. They soften into the broth as they simmer, then disappear into the crushed tomatoes when you blend everything together. The result is a soup with enough body to cling to a spoon, while the tomato flavor stays front and center.

That texture depends on letting the lentils become very soft before blending. If they’re still firm, an immersion blender won’t turn them into the same even, velvety base; you’ll notice tiny bits instead. The blend also helps the onion and lentils become part of the soup rather than leaving a chunky tomato-and-vegetable texture. It’s a useful approach when you want a filling bowl but don’t want to add flour or cream to thicken it.

What the Lentils, Tomato Paste, and Yogurt Each Bring

• Red lentils — They soften quickly and blend into the soup, giving it body as well as plant-based protein. Rinse them before cooking to clear away any loose dust, and pick through for small bits of debris.
• Crushed tomatoes — Canned crushed tomatoes give the soup a consistent tomato base without peeling or chopping fresh tomatoes. Brand differences show up in sweetness and texture, but an everyday can works well here.
• Tomato paste — This concentrates the tomato flavor, so even a small amount adds depth alongside the canned tomatoes. The inexpensive tube or can is fine; stir it with the aromatics for the full minute so it warms through rather than sitting in one dense clump.
• Plain Greek yogurt — Its tang balances the tomatoes, and it adds creaminess without making the soup feel rich. Choose plain rather than flavored yogurt; sweetened varieties would pull the soup in the wrong direction.
• Dried oregano — Dried herbs work well in this simmered soup because they have time to release their flavor. Keep the jar sealed and away from the stove so the oregano doesn’t lose its aroma.

Build the Tomato Base Before the Lentils Simmer

Soften the Onion Slowly

Warm the olive oil in a 5-quart Dutch oven over medium heat, then add the chopped onion. Cook for 5 to 7 minutes, stirring occasionally, until the pieces are softened and look glossy rather than crisp around the edges. If they start browning quickly, lower the heat; the goal is a soft base, not browned onion. Taking this time gives the soup a gentler, sweeter onion flavor.

Wake Up the Garlic and Tomato Paste

Add the minced garlic, tomato paste, and dried oregano to the softened onion. Stir for 1 minute, just until the garlic smells fragrant and the paste is worked through the onion. Keep the mixture moving so the garlic doesn’t catch on the bottom of the pot. If it starts sticking or darkening, turn the heat down rather than letting it scorch.

Simmer Until the Lentils Give Way

Stir in the rinsed lentils, crushed tomatoes, vegetable broth, kosher salt, and black pepper. Bring the pot to a boil over medium-high heat, then reduce the heat to low, cover, and simmer for 20 to 25 minutes. The lentils should be very soft when pressed against the side of the pot with a spoon. If they still feel firm, give them more time at a gentle simmer before blending.

Blend the Soup Until Smooth

Remove the pot from the heat, then blend the soup with an immersion blender until smooth. Keep the blender head submerged as it runs to limit splashes, and move it around the pot so you don’t leave pockets of whole lentils. Pause and check the texture; a few more passes usually smooth out any small pieces. The soup should look evenly colored, with no visible lentils or onion pieces.

Stir in the Yogurt Gently

Whisk a ladleful of hot soup into the Greek yogurt in a medium bowl. Once the mixture looks smooth, stir it back into the pot until fully combined. This gradual mixing brings the yogurt closer to the soup’s temperature before it goes in. Stir until the color is even and the surface looks creamy rather than streaked.

Easy Swaps That Keep the Soup’s Texture on Track

Questions That Come Up When Making This Tomato Soup

High Protein Tomato Soup

High protein tomato soup simmers red lentils with crushed tomatoes, garlic, and oregano in a Dutch oven. Blended until smooth and finished with tempered Greek yogurt, it has a creamy texture without cream.

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Prep Time 10 minutes mins

Cook Time 33 minutes mins

Total Time 43 minutes mins

Servings: 4 servings

Course: Lunch

Cuisine: American

Calories: 280

Ingredients Equipment Method Notes

Ingredients

  

• 1 tbsp olive oil
• 1 yellow onion medium, chopped
• 3 cloves garlic minced
• 2 tbsp tomato paste
• 1 tsp dried oregano
• 1 cup red lentils rinsed
• 1 can (28 oz) crushed tomatoes
• 4 cups low-sodium vegetable broth
• 1 tsp kosher salt
• 0.25 tsp black pepper
• 1 cup plain nonfat Greek yogurt

Equipment

• 1 5-quart Dutch oven
• 1 Immersion blender
• 1 medium bowl

Method

 

1. Heat the olive oil in a 5-quart Dutch oven over medium heat, then add the onion and cook for 5 to 7 minutes, stirring occasionally, until softened.
2. Add the garlic, tomato paste, and oregano and cook for 1 minute, stirring, until fragrant.
3. Stir in the lentils, crushed tomatoes, broth, salt, and pepper, then bring to a boil over medium-high heat.
4. Reduce the heat to low, cover, and simmer for 20 to 25 minutes, until the lentils are very soft.
5. Remove the pot from the heat and blend the soup until smooth with an immersion blender.
6. Whisk a ladleful of hot soup into the Greek yogurt in a medium bowl.
7. Stir the yogurt mixture into the soup until fully combined.

Notes

For the smoothest finish, temper the Greek yogurt with hot soup before stirring it into the pot. Refrigerate leftovers for up to 4 days; freeze for up to 3 months. For a dairy-free version, use plain unsweetened plant-based yogurt.