Marinate Crab with half teaspoon of chili powder, coriander powder, turmeric and salt. Let it rest for 1 hour.
After 1 hour in a vessel add 2 tbsp of oil and when the oil is hot and finely chopped onion and sort it nicely.
Once the onions are translucent and the finely chopped tomatoes and the green chili.
Saute the tomatoes until it becomes mushy. Now transfer the content to a food processor and grind them into a coarse paste.
In the same vessel add 4 tbsp of oil and add the spices one by one and fry for a min.
Add ginger garlic paste and fry till raw smell of ginger goes off.
Add the coarse onion tomato paste and allow to boil for 5 min in medium flame.
Add the marinated crabs.
Add salt, chili powder, coriander powder turmeric if needed.
Add the handful of coriander and Curry leaves.
Now Add the water and cover and cook for 10 minutes or until the crabs are cooked nicely.
Once the crabs are nicely cooked add one cup of coconut milk and cook for another 5 to 7 minutes.
Once the gravy becomes thick, switch off the stove.
Crab Gravy is ready to be served.