How I cook chicken karahi/ chicken karahi

Chicken 2kg
Onion one large
Tomato 1/2 kg
Green chilli 2-3
Garlic 8-10
Ginger 1 inch piece
Green coriander as needed
Salt to taste
Black paper 1 1/2 tbsps
Coriander powder 2 tbsps
Zeera(cumin )1 tbsps
Garam masala 1/2 tsp