Heat some coconut oil in a heavy based pan and fry dessicated coconut with small onions, ginger, garlic, green chilli ,curry leaves, saunf and cinnamon stick till dark brown.
Add coriander powder, turmeric and a bit of salt and take the pan from the fire.
Grind this mixture and keep aside.
4)In a pressure cooker add some coconut oil and fry the big onion and add the crab pieces and fry for 2 o 3 minutes.
5)Add the ground mixture to the crab and cover the cooker and pressure cook for 2 whistles.
Switch the stove off and open once the pressure is relieved add salt if needed.
In another kadai heat some coconut oil and splutter mustard seeds, red onion and red chillies with curry leaves.
:- U can also add thinly cut coconut pieces if u like the taste and once the coconut is brown add it to the crab.
:- Tasty crab curry is ready!!!