To clean cauliflower florets, soak them in hot salted water for 15 minutes.
Boil cauliflower florets in salted water over medium flame for 3-4 minutes. After boiling, drain excess water and pat dry florets on tissue paper.
Mix maida, corn flour, ginger- garlic paste, chilly powder, water and salt in a bowl to make a batter. Make sure that batter is not too thick or not too thin. Add all florets in batter and mix well. For perfect manchurian, batter should coat the florets evenly.
Deep fry the florets
Heat 2-tablespoons oil in a wide, thin-bottomed pan or wok on medium flame. Add 2 teaspoons ginger paste, 1½ teaspoons garlic paste, chopped green chillies, chopped capsicum and chopped onion.
Sauté them on high flame for 3-4 minutes.
Add soy sauce, tomato ketchup, chilli sauce and salt.