Soak Sabudana.Rinse sabudana 2–3 times and soak in enough water to cover for 4–6 hours. Drain well.
Boil potatoes until soft, cool, peel, and mash.
Prepare Mixture. Mix sabudana, mashed potatoes, crushed roasted peanuts, green chillies, cumin seeds, coriander, sendha namak, and lime juice.
Shape Vadas. Grease your palms and shape the mixture into 8–10 flat patties.
Heat oil over medium-high heat and deep- fry the patties in batches for 3–4 minutes, turning once, until golden and crispy.
Drain on a paper towel and serve hot with green chutney and fresh curd.