Presoak a walnut size tamarind paste in a cup of water and heat for a minute in the microwave leave to soak for about 10 minutes and strain the extract.
Heat 1 table spoon oil, add mustard seeds and let them splutter.
Add chopped onions and stir till translucent.
Add 1 tsp of ginger/ garlic paste and stir fry till you get the aroma in about 4 minutes.
Add the chopped tomato and stir fy till it gets soft and is blended with the onion mixture.
Add the turmeric, chilly powder and dhania powder, stir for about 2 minutes till you get the aroma.