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Lentil Soup

Comforting brown-lentil soup with onion, carrot, celery, tomato and greens, simmered gently so the lentils stay tender rather than collapsing into paste.

Prep15 minCook40 minTotal55 minYield6 servingsLevelEasy

Source-reviewed. No original CookClue test is claimed unless it is actually recorded.

Rustic bowl of brown lentil soup with intact lentils, carrots, celery, tomato and spinach, garnished lightly with herbs, editorial food photography

Before you start

What this method is trying to achieve

For a soup with distinct lentils, variety and simmer intensity matter more than constant stirring. Brown or green lentils can stay intact when they are kept at a gentle simmer and checked early.

Success looks like

Know the target before you cook

The broth should be savory and lightly thickened, with tender vegetables and lentils that are soft through the center but still visibly distinct.

Ingredients

What you need

Base

  • 2 tbsp olive oil

Vegetables

  • 1 medium yellow onion, diced
  • 2 medium carrots, diced
  • 2 stalks celery, diced

Aromatics

  • 3 cloves garlic, minced

Spices

  • 1 tsp ground cumin
  • 0.5 tsp dried thyme

Lentils

  • 300 g brown or green lentils, rinsed and picked over

Liquid

  • 1.5 L vegetable broth

Tomato

  • 400 g canned diced tomatoes

Finish

  • 100 g baby spinach
  • 1 tbsp fresh lemon juice

Seasoning

  • 1 tsp kosher salt, plus more to taste

Method

Cook by the cues, not just the clock

Build base

  1. Heat olive oil and cook onion, carrot and celery until softened but not deeply browned; add garlic, cumin and thyme for the final minute.

Add lentils

  1. Stir in rinsed lentils, broth and tomatoes and bring just to a simmer.

Simmer gently

  1. Lower the heat so only small bubbles break the surface and cook until the lentils are tender, checking early near 25 minutes.

Finish

  1. Stir in spinach until wilted, then remove from the heat and season with lemon juice and salt.

Serve

  1. Rest uncovered for 5 minutes, adjust broth consistency if needed and serve.

Critical checkpoints

Stop here and check

other

Right lentil?

Brown or green lentils are being used when intact texture is desired.

Use red lentils only when a softer, creamier result is acceptable.

temperature

Gentle simmer?

Only small bubbles and gentle movement are visible.

Lower the heat if the pot is rolling hard.

other

Lentils mushy?

The lentils split, smear or lose their individual shape.

Use lentils-mushy to check variety, simmer intensity, cook time, stirring and hot holding.

If yours looks different

Route the failure before changing the recipe

The lentils lose their individual shape and become overly soft or paste-like.Lentils mushy? Diagnose variety, simmer intensity, cook time and stirring.

Why Are My Lentils Mushy?

After cooking

Storage, reheating & substitutions

Storage

Refrigerate promptly in a covered container for up to 4 days or freeze for longer storage.

Reheating

Reheat gently, adding a splash of broth or water because lentils continue to absorb liquid in storage.

Substitutions

Use green lentils for a firmer texture. Red lentils can be substituted only if a softer, creamier soup is acceptable.

Evidence

Sources & methodology

Technical claims and method decisions are tied to sources. Recipe-specific advice is not presented as a universal food-science law.

  1. Lentil SoupFood Network / Giada De Laurentiis

    Food Network builds lentil soup from a sautéed vegetable base and simmers lentils gently until almost tender.

    publisherPassage verified
  2. Perfect LentilsFood Network Kitchen

    Food Network says gentle simmering and minimal stirring help lentils stay tender and intact.

    publisherPassage verified