01 - Heat olive oil in a large pot over medium heat. Add the onion, carrots, and celery. Sauté for 5 to 7 minutes until the vegetables are softened and the onion is translucent.
02 - Stir in the garlic, ground cumin, smoked paprika, and ground coriander. Cook for about 1 minute until fragrant, stirring constantly to prevent burning.
03 - Add the rinsed lentils, drained diced tomatoes, vegetable broth, bay leaf, black pepper, and salt. Stir well and bring to a rolling boil.
04 - Reduce heat to low and simmer uncovered for 35 to 40 minutes, or until the lentils are fully tender and the flavors have melded together.
05 - Remove and discard the bay leaf. Stir in the lemon juice and adjust salt and pepper to taste.
06 - For a creamier consistency, partially blend the soup using an immersion blender, leaving some lentils whole for texture.
07 - Ladle into bowls and serve hot, garnished with freshly chopped parsley.