Take water in a small bowl
Gently grease both hands with little water
In one hand take a small portion of the batter and roll. Make sure water is not dripping from the hand
Press it on the other hand and make a hole in the center, carefully add it to the hot oil
Alternatively, you can grease parchment paper / plastic sheet with little water and take a small portion of the batter, roll, and press, make a hole, carefully add it to the hot oil
You can also take a small ball-shaped batter in your right-hand fingers. Roll and make a hole in the center using your right-hand thumb finger .carefully Invert your hand over oil and drop the vada by slightly tilting your finger or slide the vada using your thumb finger