Begin by peeling the skin off of the onions and slicing them into pieces.
Chop up some green chilies as well.
Heat up around 150ml of vegetable oil in a pan.
Fry two dry red chilies in it until they become crispy.
Remove the fried chillies from the pan and set them aside.
Move the chopped onions to a bowl and add the fried dry red chilies and green chilies to it.
Add 6 tablespoons of besan (gram flour), 2 teaspoons of rice flour (optional, but necessary for a crunchy texture), 1 teaspoon of baking soda, and 1 teaspoon of salt.
Crumble the fried red chili and mix all of the ingredients together using your fingers for one minute.
The onions should start releasing moisture.
Add 50ml of water and mix for another minute.
Repeat with 50ml (or less) of water and 1 tablespoon of besan.
The batter should not be runny.
Let the mixture sit at room temperature for 15 minutes before frying Bengali onion fritters.
Use the same oil that was used to fry the red chillies.
Heat it properly before lowering the heat to medium.
Fry 2-3 piyaji at a time, depending on the diameter of the kadhai being used.
Fry each side for no more than 1 minute. Flip them over and repeat for the other side. Once they're a nice brown color, strain them.
Continue frying the remaining fritters using the same method.
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