South Asian Tuna Melt is a sandwich that combines tuna, cheese, vegetables, and spices. The dish involves sautéing onions and chilies in butter with a seasoning mix, and then mixing this with tuna, yogurt, lemon, and other ingredients. The sandwich is built by adding cheddar cheese, tuna mix, and tomato to bread, and then cooking in a pan. The resulting sandwich is spicy, hearty, and full of flavor.