Soak urad dal for 6 to 7 hours or overnight
take blended jar add soaked urad dal blend it into a croarse paste
take a kadai add oil to it, let it heat
in a mixing bowl add blended dal, hing powder, black pepper powder, salt, cumin seeds
mix all these ingredients and beat it well
now add chopped onion, green chillies, Curry Leaves, coriander leaves and baking soda
mix it well
take small dumpling add in a hot oil
fry it until golden brown colour
drain vada on kitchen tissue to remove excess oil
serve the Vada with tomato sauce or any sweet chutney