||In a large pot heat oil and brown onions..
||Add green chillies, curry leaves, ginger and garlic.
||Place in all the crab lower to medium heat, replace the lid and simmer for 10 minutes..
||Next add in all spices, mix and cook for a further 3-4 minutes..
||Liquidise the tomatoes and and add to the pot. Add salt to taste as well as brown sugar to cut acidity.
||Mix through, replace the lid and simmer for a further 10 minutes..
||Next, remove the lid, increase the heat to remove excess water from the tomatoes and thicken the gravy..
||Pour in the tamarind water and bring to the boil to finish..
||Remove from heat and leave to stand. The gravy will thicken on standing..
||Serve hot with basmati rice!.