01 - Preheat oven to 425°F. Line a baking sheet with parchment paper. Cut red bell peppers in half, remove seeds, and place cut-side down on the baking sheet. Roast for 20-25 minutes until skin is blistered and charred.
02 - Transfer roasted peppers to a bowl, cover tightly, and let steam for 10 minutes. Peel off skins and roughly chop the peppers.
03 - In a large pot, heat olive oil over medium heat. Add diced onion, carrot, and celery. Sauté for 5-6 minutes until softened and fragrant.
04 - Stir in minced garlic, smoked paprika, ground cumin, dried thyme, and chili flakes. Sauté for 1 minute until spices become fragrant.
05 - Add the chopped roasted peppers, diced tomatoes with their juice, rinsed lentils, bay leaf, and vegetable broth to the pot. Stir well to combine all ingredients.
06 - Bring the mixture to a boil, then reduce heat to low. Cover and simmer for 25-30 minutes until lentils and vegetables are completely tender.
07 - Remove and discard the bay leaf. Use an immersion blender to partially blend the soup, leaving some texture for a hearty consistency. Season generously with salt and black pepper to taste.
08 - Ladle hot soup into bowls. Garnish with freshly chopped parsley and serve with lemon wedges on the side for a bright finish.