Make a paste of onion, green chili and ginger garlic paste with very little water. You will make a coarse paste with minimum water. keep this aside.

Add flour, turmeric, ajwain, salt, red chili powder and soda to a large mixing bowl.

Peel raw banana and slice them thin. Add them to a bowl of water.

On a medium flame, heat a deep pan with enough oil for frying.

Add the paste made at step 1 to the mixing bowl and mix well along with extra enough water to make the batter of a thick but pouring consistency. I suggest you refer the pic. Add more salt if needed.

Drain the sliced banana and add them to a colander. There must be no water left dripping.

When the oil gets hot, put on the flame to medium heat.

Dip sliced banana one at a time in batter and gently drop in the hot oil. Avoid disturbing for a few minutes.

Deep fry till golden & crisp on a medium flame.

Remove them to a steel colander or cooling rack.

Mix chopped onions, green chili, coriander leaves, salt and lemon juice. slit the fritters in the center and stuff them with the onion mix and serve immediately.