Prawn Butter Masala

Name: Prawn Butter Masala
Ingredients: 250 gms fresh medium prawns; 1 tbsp curd; 1 tbsp tomato puree; 1 tsp ginger garlic paste; 1/4 tsp turmeric powder; to taste salt; 1 onion chopped roughly; 7-8 cashew nuts; 1 1/2 tsp ginger garlic paste for gravy; 2 tbsp tomato puree; 1 tbsp butter; 2 tbsp refined oil; 1 tsp ghee; 2 green cardamoms; 1 inch small stick cinnamon; 4-5 cloves; 1 tbsp ready to use butter masala powder; 1/4 tsp red chilli powder; 1 tbsp kasoori methi; 1 tbsp coriander chopped; 1 green chilli; 1 tbsp malai or fresh cream