Paruppu Urundai Kuzhambu is a traditional South Indian dish that is popular in Tamil Nadu. It is a tangy and spicy gravy made with lentil dumplings (paruppu urundai) that are cooked in a tamarind-based sauce. The lentil dumplings are made by soaking and grinding split yellow lentils (toor dal) and mixing them with spices and herbs, then shaping them into small balls and steaming or frying them. The tangy sauce is made by cooking tamarind pulp with a blend of spices, onion, garlic, and tomato, and then adding the lentil dumplings to it. The dish is typically served with rice, and it is a nutritious and filling meal that is rich in protein, fiber, and essential nutrients.