Pacha Kollu Rasam is a healthy and flavorful South Indian soup made with horse gram lentils and a blend of spices. It is known for its medicinal properties and is often consumed during winters to keep the body warm. The lentils are cooked until soft and then simmered in a tangy tamarind and tomato broth. This rasam is easy to make and can be served as a soup or with steamed rice.