Soak the Urad Dal in 2 cups water for 5 – 6 hours.Drain and grind to a fine paste using almost no water.If the dal has problems in grinding then use 1 – 2 tbsp water.Beat with a spoon for 4 – 5 minutes for a great aeration!Mix salt and pepper and stir well.
Heat the oil on medium heat in a frying pan.Add all the grated vegetables into the lentil paste and mix with hands till well amalgamated.Add 1 tbsp of water if mixture is very thick.
With moist hands take a lemon sized ball of the mixture and flatten it on your palm.Make a hole in the middle with your forefinger so that it looks like a doughnut.Deep fry all the vadas in hot oil on medium heat till golden brown and crisp.Drain on an absorbent kitchen towel.
Serve warm with Sambar or Chutney of your choice.