Heat oil in a pressure cooker. Add the onions and chillies and saute till soft.

Add in the ginger garlic paste and saute till the raw smell is gone.

Add the tomatoes along with the masala powders and salt and cook till the tomato is mashed.

Add in the washed crabs and close the lid of the cooker.

Cook for 1 whistle on high. Then place the flame on simmer and cook for another 10 minutes Switch off and allow the pressure to go by itself.

Open the lid and switch on the flame. Adjust the seasoning.

Sprinkle in the garam masala and mix well. Serve warm with chapathis or as side for rice.