Turn ON Instant Pot to saute mode (high), add 1-1/2 cups of water to the inner pot of IP and bring it to a boil.
While water is heating, grease the Idli mold with some oil.
Add fruit salt to the batter and mix well. Pour spoonful of batter into each mold.
Place the Idli stand in IP. Cover the IP with a glass lid. Note: You can use the IP lid with pressure value on venting position.
Cancel saute mode. Turn ON steam mode, set external timer for 8 minutes. Note: IP timer does not work with steam mode.
After 8 minutes, insert a clean knife in the center of the idli, if it comes out clean, then idli is done. If not, steam idli for couple of minutes more. It takes around 8-10 minutes for idli to cook. Note: Do not overcook the idli it will turn hard.
Once Idli are done, carefully remove the Idli stand, using a spoon or a knife, remove Idli from the mold.
Idli is ready to be served. Serve Idli with some sambar and coconut chutney.