Urad Dal - 1 cup, washed and soaked with 1 tsp of fenugreek in water for at least 4 hours Idli Rice - 4 cups, washed and soaked in water for at least 4 hours Salt In a wet grinder, add the soaked Urad Dal and grind until it becomes smooth and fluffy. Transfer the batter to a large bowl and set aside. Next, grind the soaked Idli Rice until smooth and pour it over the Urad batter. Mix both batters together until they blend into a single smooth batter. Let the batter rest overni