Onion Uttapam is a savory pancake made with a fermented batter of rice and lentils. It is topped with a generous amount of finely chopped onions and green chilies, which gives it a delicious and tangy flavor. The batter is made by soaking rice and lentils for a few hours, grinding them into a smooth paste, and then fermenting it overnight. The fermented batter is then spread on a hot griddle and cooked until crispy and golden brown. Serve this mouthwatering Onion Uttapam with coconut chutney or tomato chutney for a delightful breakfast or brunch.