Clean and soak urad dal for 2 hours in a bowl with 1 cup water. Drain water completely.
Grind it to a smooth paste without adding water. If batter is so hard sprinkle little water. At the end batter has to be thick as possible.
Add green chilies and curry leaves to batter.
Add chopped onions, chilies, peppercorns, ginger chopped, salt, baking soda to this batter and mix well.
Mix well properly. Add 1 spoon rice powder to this and mix well for getting crispiness to vada.
Keep a cup of water near by and wet the hands to prevent sticking of batter. Make round balls with palm and press gently. With finger we have to make a hole in center.
Heat oil in a kadai and drop the round shaped batter to hot oil. Fry them for 5 minutes until it becomes golden brown.
When this vada become brown in color it is ready to take from oil.
Serve hot with chutney and sambhar.