Clean and soak white lentil in water for 2 hours.
Drain the water and add urad dal, ginger, a pinch of asafoetida, salt to taste and grind it to make a smooth paste. Add minimum water to grind and then transfer the batter into a bowl. Add chopped curry leaves and green chillies in it.
Heat some oil in a frying pan. Take a spoonful of batter in a wet plastic sheet and shape it into a circle. Wet your hands and make a hole in between and drop it into the oil carefully. You can even shape it in your hand once you become an epxert in becoming vada.
Deep fry in oil on low flame till it turns golden brown. Serve it hot with some coconut chutney.