Take peeled and cleaned prawns and mash them into rough pulp.
Boil potatoes till tender. Peel them and mash into paste.
Take a big bowl. Add the mashed potatoes, prawn pulp, green chilly and onion pieces. Add red chilly powder, ginger-garlic paste, garam masala powder, salt and two spoons of oil. Mix well and leave aside for about 20 minutes.
In the mean time, take corn flour, maida flour and egg white into a bowl. Add little salt and prepare a thick dough.
Now add the marinated prawn mix to the dough. See that a thick constituency is maintained.
Prepare three inch size thick round discs with the dough.
Heat the oil in a deep bottomed pan and deep fry the discs(cutlets) on medium flame.
As they turn into brown colour, remove them and serve hot with onion slices and hot and sweet sauce.