Whilst, Take a frying pan,add oil,add chopped onions,grated ginger,finely chopped garlic and fry till raw smell goes off.
Add red chilli paste (prepare by mixing 1 tablespoon water with ½ tablespoon red chilly powder),soya sauce,vinegar ,salt ,sugar and mix well.
Add ⅓ cup water and bring to boil and cook till it thickens like a sauce.
By now chicken would have baked, or cooked , remove from the oven or pan , respectively
Add baked chicken to the above prepared sauce mix , Toss well so that chicken is completely coated with sauce.
Keep it in simmer for 3-5 minutes for flavours to blend.
Turn off the heat,garnish with coriander leaves and spring onions.
Serve hot with schezwan sauce.