Parboil cauliflower florets in salted hot water for 2–3 minutes. Drain and set aside.
Mix maida, cornflour, pepper, ginger-garlic paste, salt, and a little water to make a thick batter.
Coat cauliflower florets in the batter and deep-fry until golden and crispy. Set aside on paper towels.
Heat oil in a wok or pan. Sauté garlic, ginger, and green chilies until aromatic.
Add onions and capsicum. Stir-fry on high flame for 2–3 minutes.
Add soy sauce, chili sauce, ketchup, vinegar, sugar, and salt. Mix well.
Add the fried cauliflower to the sauce. Toss quickly to coat evenly.
Garnish with chopped spring onions. Serve hot!