Onion Uttapam is a popular variation of Uttapam that is loved by many. It is made by topping the Uttapam batter with a generous amount of finely chopped onions. The onions add a sweet and tangy flavor to the dish. To make Onion Uttapam using a food processor, prepare the batter as usual and spread it on a hot griddle. Then, sprinkle a generous amount of chopped onions on top and press them gently into the batter. Cook until golden brown and serve hot with coconut chutney or tomato chutney.