Lemon Rasam is a refreshing and tangy soup made with lemon juice, tamarind, and spices. It is a perfect remedy for a sore throat or a common cold. The recipe involves cooking the tamarind pulp with tomatoes, turmeric, cumin, and black pepper, and then adding lemon juice at the end. The result is a zesty and flavorful rasam that can be enjoyed as a soup or with rice.