4 onions preferably red 1/2 tsp. salt onions 1 Tbsp. water 3 Tbsp. oil 1/2 tsp. mustard seeds 3 red chilies 1/2 tsp. urad dhal 1/4 tsp. tamarind (extract)
Cut onions into small pieces and saute them in 2 tablespoons of oil for 5 minutes. Keep stirring. A minute before removing from fire, add the red chilies. Remove from heat and grind them in blender with tamarind, salt and water into a fine paste. Heat 1 tablespoon of oil over medium fire in a fry pan. Saute mustard seeds and urad dhal. When mustard seeds crack, add the paste into it. Mix well and remove from heat. Goes well with dosai.