1.Blend or process coconut, undrained tomatoes, ginger, mustard seeds and tamarind until pureed.
2.Heat oil in large pan. Cook onions and garlic, stirring, until browned lightly. Add spices, cook, stirring, until fragrant.
3.Add beef and brown, stirring, 5 minutes. Pour in water and simmer, 1 1/2 hours until beef is tender. Serve with steamed rice, if you like.