Add chopped onions, and fry till it becomes soft.
Now add garlic, ginger and cook for some more minutes.
Add tomato, salt and cook covered till the tomatoes become mushy. Keep this aside for cooling.
Meanwhile, clean and wash the prawns.
Use a blender to grind the cooked onion-tomato mixture into a smooth paste.
In a hot pan, add oil. Next, add the ground paste and cook for 5 minutes.
Now add all masala powders mentioned in the ingredients and saute.
Add enough water to make it into a curry.
Finally, add curry leaves and serve hot.
