Grate ginger. Slice green chilly into small pieces. Fry grated ginger in coconut oil until it becomes golden brown and grind. Mix salt and tamarind juice. Add turmeric powder, chilli powder, asafoetida,fenugreek powders and jaggery.Keep aside.Heat a pan, add coconut oil, fry mustard, onion,green chili, curry leaves,add fried ginger, tamarind mix and boil. Stir to make a slightly thick consistency.Remove from heat.