Easy butter chicken

Heat 2 table spoon butter and 2 table spoon oil. Saute 1 sliced onion until transparent. Add salt,2 tsp ginger garlic paste, 2 table spoon red chilli powder,1 pinch of red food colour, 1 tbsp dhaniya, 1/2 tsp turmeric, tomato puree (2 tomatoes) and cashew paste (1 fist of cashew nuts). Cook this into a gravy by adding 1-2 cups of water. Add 300 g boneless chicken cut into small pieces. Cook until gravy thickens and oil separates.