In a mixing bowl, add prawns, red chilli powder, turmeric powder, garam masala powder, cumin powder & salt.
Add ginger-garli paste, lemon juice and mix the spices with prawns.
Set aside prawns to marinate for 10 minutes.
Once marinated, add curd (yogurt), besan (gram flour) & rice flour. Add 1/4th cup water and mix well.
The batter of besan & rice flour should nicely coat the prawns so do not add too much water.
Heat oil in a kadhai to deep-fry the prawns.
Fry a few prawns at a time so as to not overcrowd the kadhai.
Fry on a medium flame for 3 minutes or till the prawns turn golden brown in colour.
Transfer the fried prawns on an absorbent paper.
Serve immediately with slices of onions & sprinkle some lemon juice on top.
You can also sprinkle some chaat masala on the top while serving.