Try this sabudana idli recipe, or contribute your own.
Dry sago must plump fully without dissolving into paste. Combine the dry components with two cups of sour curd and roughly one cup of water immediately. The resulting mixture needs to feel noticeably watery before resting overnight. Starch granules swell significantly over eight hours. Stir the fermented batter gently the next morning to preserve the intact sago pearls. Add a quarter cup of water only if the texture remains too thick to pour smoothly into the greased plates.
Baking soda creates carbon dioxide bubbles when exposed to the acidic fermented dairy. Fold in the pinch of soda just before steaming, and pour the batter into the oiled moulds immediately. Delaying this step causes the trapped gas to escape, resulting in flat cakes. Steam the portions over medium heat for eight to ten minutes. Turn off the heat and let the steamer rest for five undisturbed minutes before extracting the idli.