01 - Heat olive oil in a large soup 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 minced garlic, ground cumin, smoked paprika, and ground coriander. Cook for about 1 minute, stirring constantly, until the spices are fragrant and evenly coated over the vegetables.
03 - Add the rinsed lentils, drained diced tomatoes, vegetable broth, bay leaf, black pepper, and salt. Stir well to combine and bring the mixture to a rolling boil.
04 - Reduce the heat to low and simmer uncovered for 35 to 40 minutes, stirring occasionally, until the lentils are fully tender and the flavors have melded together.
05 - Remove and discard the bay leaf. Stir in the fresh lemon juice and adjust the salt and pepper to taste.
06 - For a creamier, thicker consistency, partially blend the soup using an immersion blender, leaving some lentils whole for texture.
07 - Ladle the hot soup into bowls and garnish generously with freshly chopped parsley. Finish with a drizzle of olive oil if desired.