Red Lentil Soup with Cumin and Lemon

Red lentils cook quickly and break down into a thick, creamy consistency without any dairy. This version starts with a base of sautéed onion and carrot, then adds earthy cumin and smoked paprika. A squeeze of fresh lemon juice at the end brightens the flavors.

To develop more flavor, the ground spices are toasted briefly in hot oil with the aromatics before adding liquid. This step, sometimes called blooming, makes the spices more fragrant. The soup’s texture can be left chunky or blended until smooth. For another comforting meal, try our classic chicken noodle soup from scratch.

Ingredients

Makes About 6 servings

• 2 tablespoons (30 ml) olive oil
• 1 large yellow onion, chopped
• 2 medium carrots, peeled and chopped
• 3 cloves garlic, minced
• 1 tablespoon ground cumin
• 1 teaspoon smoked paprika
• 1/2 teaspoon ground black pepper
• 1 1/2 cups (300 g) red lentils, rinsed and drained
• 6 cups (1.44 L) vegetable broth
• 1 (14.5-ounce / 411 g) can crushed tomatoes
• 1 teaspoon salt, or to taste
• 1 large lemon, for juice
• 1/4 cup (10 g) fresh parsley or cilantro, chopped, for garnish

Method

1. Sauté the vegetables Heat the olive oil in a large pot or Dutch oven over medium heat. Add the chopped onion and carrots and cook, stirring occasionally, until softened, about 6 to 8 minutes.
2. Bloom the spices Add the minced garlic, ground cumin, smoked paprika, and black pepper to the pot. Cook, stirring constantly, until the spices are very fragrant, about 1 minute. This step toasts the spices and deepens their flavor.
3. Add lentils and liquids Pour in the rinsed lentils, vegetable broth, and crushed tomatoes. Stir everything together to combine, scraping up any browned bits from the bottom of the pot.
4. Simmer the soup Increase the heat to bring the soup to a boil, then reduce the heat to low. Cover the pot and let the soup simmer gently until the lentils are completely soft and have started to break down, about 20 minutes.
5. Finish and season Turn off the heat. Stir in the salt and the juice of half the lemon. Taste the soup and add more salt or lemon juice if needed.
6. Garnish and serve Ladle the soup into bowls. Garnish with fresh chopped parsley or cilantro and serve with the remaining lemon cut into wedges for anyone who wants extra brightness.

Tips for Success

Rinse Your Lentils: Before cooking, place the dry red lentils in a fine-mesh sieve and rinse them under cold running water. This removes any dust or debris. Drain them well before adding them to the pot.

Adjusting Consistency: Red lentils absorb liquid and will continue to thicken the soup as it sits. To make the soup thinner, stir in more vegetable broth or hot water. For a thicker, more stew-like result, simmer it for a few extra minutes with the lid slightly ajar.

For a Creamier Texture: For a smoother, more uniform texture, you can use an immersion blender to partially or fully blend the soup in the pot. If using a standard blender, let the soup cool slightly first. Blend in batches with the blender lid vent open and covered with a folded towel to allow steam to escape.

Variations and Swaps

This recipe is flexible and can be adapted to your taste and the ingredients you have on hand.

• Add More Vegetables: Finely chopped celery can be added with the onion and carrots. You could also add a diced potato or sweet potato along with the lentils, which may require a slightly longer cooking time.
• Introduce Leafy Greens: Stir in a few handfuls of fresh spinach or chopped kale during the last 5 minutes of cooking. Simmer just until the greens have wilted.
• Experiment with Spices: Other warm spices can be used. Consider adding 1 teaspoon of ground coriander or 1/2 teaspoon of turmeric with the cumin. A pinch of red pepper flakes can also be added for gentle heat.
• Healthy Swaps: To add more plant-based protein and fiber, consider adding a can of rinsed and drained chickpeas with the lentils. You can use low-sodium vegetable broth to manage the salt content.

What to Serve with Lentil Soup

While this soup can be a meal by itself, serving it with a side can make it more substantial. Warm, crusty bread or whole-wheat pita is good for dipping. A simple green salad with a light vinaigrette provides a fresh contrast. For added richness, a dollop of plain yogurt or a drizzle of olive oil can be added to each bowl. A side of black bean and corn quesadillas would also pair nicely.

Storing and Reheating

Leftover red lentil soup stores well and its flavors often meld and deepen overnight. Follow these guidelines for safe storage:

• Refrigeration: Cool the soup and refrigerate it in an airtight container within 2 hours of cooking. It can be stored in the refrigerator for 3 to 4 days.
• Freezing: This soup freezes well. Let it cool completely, then transfer it to freezer-safe containers or bags, leaving about an inch of space at the top for expansion. It can be frozen for up to 3 months. Thaw overnight in the refrigerator before reheating.
• Reheating: Gently reheat the soup in a saucepan over medium-low heat, stirring occasionally, until thoroughly heated. Reheat leftovers to 165°F (74°C). You may need to add a splash of broth or water, as the soup will thicken upon standing. For single servings, you can also reheat it in the microwave.

This recipe was drafted with AI assistance and checked by our editors for measures, timings and food safety. It has not been through a test kitchen. How our recipes are made.