Take a pan once heated add oil,urad dal,Channa dal, chopped ginger, handful of curry leaves ,dried red chillies,and roughly chopped onions and Little rock salt
Once the onions turns brown add tamarind,and roughly chopped tomatoes and fry them stove of the stove and transfer them to mixy jar add some rock salt as per taste and add water grind them well
Take another small pan add some oil , Mustard,red chillies and curry leave pour them to grinded mixture add water as required and serve them