Nandu Masala / Crab Fry

This is my Mother-in-laws's recipe. She is a great cook ,but she never gives her recipes easily. Here is one, I successfully managed to get . This is a fail proof recipe. The measure of the ingredients needn't be exact. It always turns out fine.

Ingredients:
Crab - 5 nos
Onion- 1 1/2

To grind:
garlic- 6 pods
ginger- 2" piece
sombu-1tsp
jeera-1/2 tsp
pepper-1/2 tsp
sambar powder-2 1/2tsps
turmeric powder-1/2 tsp
coconut - 1/2 cup (scrapped)
tomato- 2

Procedure:
Prepare a fine masala paste by grinding all from garlic to tomato. finally add onions and just grind it just a bit. Heat oil in a kadai. Add ground masala and salt. Saute until raw smell goes and color changes to light brown . Now add crab, 1/2 cup water and close the kadai.Boil for 15 mins on medium-high heat. Remove lid and cook till desired consistency.