- Heat 3 tablespoons of olive oil in a large pot over medium-high heat. Stir in the onion and garlic, and cook until the onion has turned golden brown, about 5 minutes. Stir in the tomato paste, cumin, salt, black pepper, and 1/8 teaspoon of chili powder. Cook and stir 2 minutes more until the spices are fragrant.
- Stir in the chicken broth, lentils, and carrot. Bring to a boil over high heat, then reduce the heat to medium-low, cover, and simmer until the lentils are soft, about 30 minutes.
- Use a stick blender and puree the soup right in the cooking pot. Do not puree all of the soup, leave it a little chunky.
- Stir in the lemon juice and cilantro, then season to taste with salt.