Wash and drain the vegetables and dry with kitchen towel. Add cornflour and 1/2 tsp salt and mix gently.
Heat oil in a kadhai and deep fry cauliflower and potatoes one by one till crisp and golden brown. Drain it on absorbent paper and keep aside.
Heat 2 tsp oil in an another pan. Add green chilli , garlic and ginger . Saute on high flame. Add onion and bell peppers. Saute a minute Add salt, pepper powder ,chilli sauce,tomato ketchup and soy sauce.
Mix all fried vegetables into it and mix well. Off the flame.