Heat some oil and saute the onions followed by the green chilli and the curry leaves
Add the chicken, salt to taste followed by the ginger & garlic paste and tomato paste
Add the spices and mix well to coat the chicken - leave this for a few minutes without stirring so the masala can coat the chicken
Stir the chicken as it continues to cook
Add the blanched tomatoes and the water and stir again and cook this for 5 - 7 mins or until the chicken is cooked
Note that the cooking time will increase for bone in chicken