In a bowl, mix the soaked sabudana, mashed potatoes, peanuts, green chillies, ginger, coriander, cumin, sugar, salt, and lemon juice.

Mix well, ensuring everything is thoroughly combined.

Form small flat round patties using the sabudana mixture. 

Next, warm up oil in a deep pan on medium flame.

Fry 3 to 4 vadas at a time until they turn a lovely golden brown and become crispy. 

Once they're done, take them out and place them on some paper towels to get rid of excess oil.

Serve the crispy vadas immediately with curd or chutney of your choice.