Wash urad dal in a large bowl and let it soak for at least 2 hours.
Drain the water and add the urad dal to the blender along with green chillies, pepper, ginger, and curry leaves. Add some water and make a smooth batter.
Mix some chopped onions and salt in the batter.
Wet your hands with water and take some batter. Place it on your palm and lightly flatten it.
Make a hole in the centre, softy, with the index finger.
Deep fry the Medu vadas on a medium flame. Cook them till they turn golden brown.
Serve the delicious Medu Vadas with coconut chutney, red garlic chutney and sambar.