Add onion cubes and garlic,saute it.
Now add chicken cubes and cook it until water dries.
Now add green capsicum,pineapple cubes,salt,black pepper,crushed chilli flakes,white pepper,white vinegar,chilli garlic sauce and soya sauce.
Mix well all spices, then add some water and cook to come boiling point.
Dissolve some corn flour in water and add corn flour to sauce to make a thick gravy keep the flame high.
Check the consistency of gravy; now pour the gravy in serving dish and serve it with fried rice.