Sabudana Vada

Ingredients:

3 medium potatoes
1/3 cup tapioca (sabudana)
1 teaspoon salt adjust to taste(namak)
1 teaspoon cumin seeds (jeera)
1 finely chopped green chili adjust to taste
Approximately 2 tablespoons finely chopped cilantro (hara dhania)
1 teaspoon lemon juice