clean prawns.remove the shell and de-vein.keep head and tail
in a bowl add chili powder,turmeric powder.garlic paste,lemon juice and salt.mix it well and make a paste.
marinate prawns with this and keep aside for 30 minutes.
in another bowl mix cornflour/maida,baking powder and salt.mix well ,add sufficient amount of water and make a smooth thin batter.keep aside for 15-20 minutes.
then heat oil n a pan ,dip the marinated prawns in to the batter and deep fry it until prawns become golden brown(3-4 minutes).