Soak soya beans, black gram dal and green gram separately over night. Grind them coarsely. Add salt, ground ginger and green chillies to it.
Make small sized vada. Heat oil in a thick-bottomed kadai and fry vadas to a light brown colour. Soak them in warm water for 5 - 10 minutes. Press and drain the extra water and place in a dish. Meanwhile season curds with mustards, cumin, and curry leaves.
Pour seasoned curds, salt and cumin powder over them. Serve garnished with chopped coriander leaves and chopped ginger.
