Soak urad dal in water for 4-5 hours. Then drain the water completely. Grind it in a mixer/processor as a smooth batter with minimum amount or no water. Sprinkle very little, only if necessary.
Take a spoonful of batter and drop it in the oil and deep fry them. Strain the excess oil in a tissue paper and soak them in the syrup for about 5 minutes.
Rosh Bora https://themagicsaucepan.com/desserts/bengali-sweets/rosh-bora