Heat a pan and add oil. Add onion and sauté till onion turns pinkish.
Add coriander seeds, cloves, dry red chillies and sauté.
Add freshly grated coconut and roast on low flame till coconut turns brownish.
Now add turmeric powder, tamarind mix and switch off the gas. Let the roasted coconut cool down.
After the roasted coconut cools down, add it to a mixer or blender jar along with ¾ cup water and make a smooth paste. Do not add too much water at this point. We can add water later while boiling crabs. Keep the ground paste aside.
In the same pan, add 1 tablespoon oil.
Add finely chopped onion and sauté till onion turns pinkish.
Now add marinated crabs and sauté for 5 minutes.
Pour the ground masala from mixer or blender and mix well.
Add ½ cup water and mix. You may add more water if needed.
Mix well and simmer on low flame for 10-15 minutes with the pan covered with lid.
Add salt to taste and mix well.
Garnish with finely chopped coriander leaves.
Serve hot with rice, phulkas or Goan pav(bread).