Wash the Dal very well. Drain and soak in water for 2 hours.
After 2 hours, drain the dak completely. Add green chillies and ginger.
Grind to a smooth batter, gradually adding a1-2 tbsp of water.
Add onion, coriander leaves, peppercorns, salt and a few torn curry leaves. Mix well, beating with hands.
Heat oil in a deep frying pan.
Now wet your hands, and flatten a ladle of batter into a round 2” patty. Make a hole in the centre and slip gently into the hot oil.
Similarly make other vadas, making sure not to over crowd the pan.
Fry vadas in batches, flipping frequently , till crisp and golden.