Ingredients:
1 1/2 cups of Butter milk
1 cut teasp mustard seeds
a few curry leaves
1/2 a chopped big onion or 5 small red onions
2 thin slices of chopped root ginger
1 teaspful cummin powder
1/2 teasp red chillie powder
1 cut teasp fenugreek (uluhal) powder
salt to taste

Method:
Saute/Temper mustard seeds first. Add chopped onions, curry leaves, chopped ginger and when they are well fried add chillie powder, fenugreek & cummin powder. Add butter milk and salt to taste.

When butter-milk gets warmed, take it off the fire and allow it to cool so that it would get the sour taste well. Enjoy!!