Wash sabudana a couple of times under running water and soak it for 7-8 hours or overnight.
While soaking, make sure the water just covers the sabudana / sago. Here I have taken 2 cups of sabudana / sago for which I used 1 cup of water to soak.
Our sabudana / sago pearls are soaked properly. To check, press the sago pearl between your index finger & thumb. It should mash easily which is the indicator that the sago are soaked properly. If you feel the sago is still hard, add 1/4th cup of water and soak for another 3-4 hours.
In a mixing bowl, add the soaked sabudana / sago ginger-chilli-cumin seeds paste, salt, sugar, peanut powder and boiled potatoes.
Mix all the ingredients well. Check for seasoing and adjust accordingly.
Roll this mixture into a flat disc. You may also roll them into ball-shaped vadas.
Heat oil for frying. Gently drop the vadas and fry till they are golden brown in colour. Make sure to keep the flame to medium-low.
Sabudana Vadas are ready. Transfer them onto an absorbent paper to drain excess oil.
Crispy Sabudana vadas are ready to serve. Serve them with coconut-peanut chutney.