Wash the saboodana and soak covered with water for about an hour.
Drain in a colander, and mix in potatoes, salt, peanuts, chilli powder, coriander, green chillies and the lemon juice.
Form mixture into flat, round vadas and fry in hot oil.
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Key Ingredients: tapioca, peanuts, potatoes, coriander leaves, lemon juice, rock salt, green chillies, red chilli, vegetable oil