Mattha is a maharastrian way of preparing buttermilk. It is a refreshing drink to beat the summer heat.
1. In a mixing bowl take buttermilk. Crush the ginger. Add the juice of ginger to the buttermilk. Finely chop the green chili and add to this as well.
2. Dry roast the cumin seeds. Then powder them. Add this to the buttermilk along with finely chopped coriander. Add in the salt and sugar.
3. Whisk everything well together. Serve chilled.