Cut fish into small chunks and add ginger garlic paste, pepper powder, turmeric powder, chilli powder, cornflour, all purpose flour and salt to taste.
Add little water to just coat the fish pieces. Gently mix so that the fish do not become mushy.
Heat oil in pan and fry fish until it turns crisp and golden brown.
In the same pan with leftover oil ,add crushed garlic cloves ,green chillies and onion and saute on high flame.
Add diced bell peppers and finely chopped spring onions and toss well.
Now add soy sauce, red chilli sauce, sweet chilli sauce ,tomato ketchup and vinegar and mix well on high flame.
Meanwhile mix corn starch in little water and add slurry to the vegetable gravy/sauce mixture. The gravy or sauce starts to thicken within a minute or two.
Now add fried fish to the gravy/sauce and mix gently until gravy coats well on each piece of fish.
Finally garnish with finely chopped spring onions and is ready to serve as a snack to kids or with any fried rice .
Fish Munchurian is ready to serve.