Take a pan heat 5 tbsp of oil. Add chopped onion saute it until it becomes golden brown. Then add ginger-garlic paste again saute it till raw smell and flour gone.
Now pour in tomato puree and chopped tomato into the pan.Cook it for 7-8 minutes. After that add all powdered masalas,salt,sugar and 1/2 cup of water,cook till masala releases oil. Add in prawn cook it for 5 minutes then add peas stir it well. Cook it for 10-15 minutes.
Now pour coconut milk cook for another 7-8 minutes and its done.
Garnish it with coconut milk and coriander. Serve hot with steam rice.