Sprinkle salt, turmeric powder, 1 tsp red chilli powder on the fish pieces. Sprinkle juice of ½ lemon and rub in well. Set aside to marinate for 15 minutes. Heat 2 tbsps oil in a non stick pan.
Mix garlic paste, ginger paste 2 tsps red chilli powder and salt in a bowl. Apply this masala generously over the fish pieces. Roll them in rice flour and shake off excess flour. Place the fish pieces in the pan and shallow fry till the undersides are golden.
Flip them over and shallow fry till the other side is equally golden. Drain on absorbent paper. Serve hot garnished with a lemon slice.