i don't know

Roast on tava dhania seeds,rai,jeera,methiseeds,garlic till u get a nice aroma. fry kashmiri chillies also. grind these all with coconut little tamrind,1/2 onion , little haldi pd. make a thin paste u can add water. clean the crabs well. remove shell cut the claws. Cut the crabs to 1/2. Put the masala in a vessel. Put water how thin u want the masala to be. let it boil till the raw smell of masala goes. then add salt , crabs and let it cook . check for the salt. goes well with rice.

Learnt the style from my masters servant.
Boil crabs. prepare a paste of posta, piyaz, lal sukha mircha, ziraa , fry with tel the boilded crab after washing n removing its hard cover. then deepfry the paste add namak n haldi to the paste pore water for rasha when it start boilin pore the crab into it boil in dhimi aanch for 10 minutes. may use patato to thiken the rassa. Serve hot . I m sure it will be liked by yr family memebers.

Just boil ; it is very easy!