Take 1 cup of urad dal in a large bowl
Wash urad dal thoroughly, and soak it for 3 to 4 hours with enough water
Try to use whole-skinned urad dal if available
After 4 hours transfer the urad dal to a blender or a grinder and grind it into a fine paste
Do not add too much water while grinding the batter, use a few drops of cold water to ensure smooth grinding
The batter should be smooth and thick
Transfer the batter to a bowl and thoroughly mix with your hand in one direction for a few minutes
Thorough mixing will make the batter fluffy and light
You can test the batter’s fluffiness by dropping a drop of batter into a bowl of water.If the batter floats to the top, it ensures the fluffy batter
Now add 1 finely chopped onion, ½ tsp cumin seeds, ½ tsp crushed peppercorns, 1 sprig curry leaves, 2 finely chopped green chilli, ½ tsp asafoetida/hing , ½ tsp salt and mix well
Now for frying the vada, heat oil in a deep-bottomed pan
Take a small portion of batter with your wet hands, place it in your palm and gently press it to form a thick, rounded vada
To make a hole in the middle, use your thumb
Slide the vada into the oil carefully when it reaches medium heat; add 3–4 vadas at a time
Turn over and deep-fry both sides until they are crisp and light golden brown
Remove the medu vada from the oil and drain the excess oil using tissue paper
Medu vada is ready to serve with chutney and sambar