To make a smooth batter, combine water, urad dal, and rice flour.
For the garnish, finely chop the green chilies, tomatoes, and onions.
Heat a non-stick skillet or griddle over medium heat after greasing it.
Spread the batter into a thick circle on the pan using a spoon.
Top the batter with chopped green chilies, tomatoes, and onions.
Cook over medium heat until golden brown, about 3 to 4 minutes.
Serve the uttapam with sambar or chutney after flipping it over and cooking it for one more minute.