Embassy Chicken

how to prepare(cook)Embassy Chicken ?
Ingredients

Chicken 800gms. ( cut into 8 pieces )
Butter 2 tblspns.
Onions 2 ( chopped finely )
Garlic 8-10 flakes ( crushed and chopped )
Ginger 1" piece ( chopped finely )
Green chillies 2 (chopped finely )
Maida 2 tblspn.
Milk 2 cups
Chicken stock 1 1/2 cups.
Pepper 1/2 tspn.
Salt to taste
Tomato 1 large ( chopped finely )
Tomato ketchup 2 tblspns.
Coriander 1/4 cup
Method
Pressure cook chicken pieces with 2 cups of water and salt to give 1 whistle. Remove from fire.
When the pressure drops, check to see if the chicken is absolutely tender and soft.
Remove the chicken pieces from the stock and keep aside.
Reserve the stock and mix with the milk.
Heat the butter in a heavy bottom pan.
Add onions, garlic, ginger, green chillies.
Cook till onions turn transparent.
Add maida.
Cook for 1/2 minute.
Add the milk and stock mixture to the maida in the pan, stirring continously for 2 mins. until the sauce thickens.
Now add chicken,tomatoes,pepper and salt.
Simmer for a minute. If the sauce gets thick add 1/2 cup of stock. Boil.
Garnish with tomato ketchup and chopped coriander.