1. Whip the sour yogurt
and add enough water to obtain a pouring consistency. Add gram flour to it
and set aside.
2. Scrape the ginger and finely chop and slit green chilies in two
and set aside.
3. Chop the jaggery, wash, chop the coriander leaves and set aside.
4. To the yogurt mixture add the chopped ginger, the jaggery and
salt to taste.
5. Heat oil in a pan. Add mustard seeds, cumin seeds and curry
leaves. Add slit green chilies and asafetida. Add the yogurt mixture and
stir constantly till it boils.
7. Cook on slow flame for 5-8 minutes.