Buttermilk dosa is a popular South Indian dish made from fermented rice and lentil batter. It is a thin and crispy pancake-like crepe that is light and tangy in flavor. The addition of buttermilk gives it a unique taste and texture. It is typically served with coconut chutney and sambar, a lentil-based vegetable stew. Buttermilk dosa is a versatile dish that can be enjoyed for breakfast, lunch, or dinner.