Mulligatawny

Cook 5 tbsp. butter, Aleppo, cumin, coriander, mustard, chiles, and tomato in an 8" skillet over high heat until fragrant; set sauce aside. Heat remaining butter in a 6-qt. saucepan over medium-high heat. Add ginger, garlic, onion, and jalapeño; cook until browned, 15 minutes. Add flour, coriander, cumin, and turmeric; cook until smooth, 2 minutes. Add stock and lentils; boil. Reduce heat to medium-low; cook, covered, until tender, 45 minutes. Add cilantro; purée. Add coconut milk, juice, salt, and pepper; divide among bowls. Garnish with sauce and yogurt.