Take cleaned chicken in a bowl add cornflour,black pepper, salt and mix well
Set aside to for 30 mins for marination
Heat oil for frying , drop chicken and fry till golden brown. Drain and set aside
Heat the butter in a pan, add garlic ,ginger and saute till raw smell goes off
Now add onion and capsicum and saute till, onions are translucent and tender
Add green Chilli and mix well
Add all sauces ,water,sugar and corn flour in a mixing bowl and mix well
Add to the mixture to the frying pan
Add fried chicken and cook for 2 mins and salt
Add chopped spring onion
Serve hot