Peel the boiled potato and then grate or mash it properly ,there should not be any lump in it
Add arrowroot ,salt ,1/2 tsp cumin ,1 tsp oil in the mashed potato and mix it well
In a bowl add fresh coconut, coriander, green chili,ginger,lemon juice ,sugar,cashew ,peanuts ,raisins and little salt and mix well
Make equal medium size balls from the potato mixture.
Grease your palm with oil and take a potato ball and flatten it by pressing with your finger tips.
Now put about 1 .5 tbsp of coconut mixture in the center.
Now pull it from all the sides and make a smooth ball.
Dust the ball lightly in the dry arrowroot powder or cornflour.
Heat enough oil to deep fry in a deep and broad pan
Add few balls in the pan and deep fry on medium heat
When buff vada become golden from all the sides then remove on a paper napkin.
Serve hot.