Take a potato and wash it well. Slice it thinly using a mandoline slicer. Keep it aside.
In a bowl, add besan flour, rice flour, red chilli powder, salt, asafoetida, cooking soda. Mix everything with your hands.
Heat oil and add two ladles of the oil into the flour.
Add water slowly and make it to a batter in dosa batter consistency.
Drop batter into the oil to check the temperature of the oil.
Dip the potato slices in the batter and gently slide it into the oil.
Keep it in medium flame and deep fry the bajji until it turns golden brown in colour.
Remove from the oil and place it on a tissue paper.
Serve it hot with chutney or it can also be eaten without any side dish.
It is one of the best evening snacks to be eaten with tea or coffee.