In a wide bowl add chopped onions, green chillies, curry leaves and coriander leaves. Next add turmeric powder, salt and cooking soda. Mix well without adding any water.
Next add gram flour and mix again. Onions have lots of moisture, you will end up with kind of thick dough.
Heat oil in a heavy bottom pan, when it is warm, add 1/4 cup of oil to the dough and mix again. This dough shoudn't be loose. Adjust with additional flour or few tsp of water to get thick consistency dough.
Next make lemon sized balls and carefully drop a batch in to hot oil. In medium flame fry them till they turn brown and crisp.
Yummy snack onion bonda is ready to serve with tea in the evening.