Gradually add water to the besan mixture, whisking continuously to avoid lumps. The batter should be smooth and flowing, similar to dosa batter consistency.
Add chopped onion, tomato, green chilies, and coriander leaves to the batter. Mix everything together so that the vegetables are evenly distributed.
-Pour a ladleful of batter onto the hot griddle and spread it gently in a circular motion to form a thin pancake -Drizzle a few drops of oil or ghee around the edges of the chilla