Rinse and soak urad dal in enough water or for at least 6-8 hours.
Let the dal sit in a colander for 5 minutes for the excess water to drain off.
Add the green chillies, black pepper, clove, red chilli, turmeric powder, coriander powder, salt, asafoetida in urad dal and blend in a mixture to a smooth batter along with little water.
Transfer this paste into a large bowl.
Add chopped coriander and whisk well.
Heat the oil in a deep pan over medium heat.
Take some water in a small bowl next to paste to shape the vada.
Soak your fingers of both the hands in water and pinch a small portion of dal paste.
Hold it over your one hand fingers and flatten it using the other hand wet fingers.
Make a hole in the centre of the flattened vada.
Gently slip it on the pan of hot oil to deep-fry.
Deep fry the vada over medium-high heat till deep golden, crisp from both the sides.
Transfer to a plate lined with kitchen towel.
Serve them hot with chutney and tea.