To a mixing bowl add 1 cup green moong dal and 2 tablespoon raw rice. Pick any stones and discard if any.
Soak in water for 6-8 hours. Set aside and keep it covered.
Rinse well atleast for 2 times.
Now add it mixer along with 1 teaspoon cumin seeds, 2 nos green chillies and 1 inch ginger, required salt. Add little water needed to grind it to a thick batter.
Grind it a smooth batter like idli dosa batter consistency.
Transfer this to a mixing bowl. Rinse the mixer with little water and add it.
Adjust water and make batter pourable.
Heat dosa tawa - sprinkle water to check. If there is a sharp shh sound then the tawa is ready.
Pour 2 small laddles of dosa batter and spread it in concentric circles as shown. Sprinkle 2 tablespoon raw onion(optional), drizzle oil.
Slightly press the onion so that it gets stuck to the batter. Cook until it turns golden.
Then flip over and cook for few seconds.
Now flip over, fold and serve. You can make thick soft dosas too.
Pesarattu is ready to be served.