To an Instant Pot, add water, salt, oil and close the lid. Make sure it is in sealing mode.
Let it cook in manual/pressure cook mode for 3 mins. Once done, release pressure quickly.
Immediately, add the flour little by little. Using a ladle, Keep mixing continuously and form a smooth dough.
Once the dough comes together, transfer it to a clean, dry bowl. Cover it with a wet cloth so that the dough doesn't dry out. If the dough dries out, the balls will have cracks.
When the dough is warm enough to handle, apply some oil to your hands and start making small balls. Keep the rest of the dough covered until everything is fully done.
Now we are going to steam the balls. Make sure you clean the inner pot or use another inner pot before the next step. Alternatively, you can steam on the stovetop.
Add 1 cup water to the inner pot of the IP. Grease an idli pan or steamer basket with oil. Place the rolled balls in a idli pan or steamer basket and place it inside the inner pot. Steam it for 8 minutes in your Instant Pot. Release pressure quickly.
Once all balls are done, just pat dry the inner pot using a tissue paper.
Now keep the Instant Pot on saute mode. Add oil. Once hot, add mustard seeds and curry leaves. Once they splutter, add the cooked balls.
Saute for a minute. Add idli podi and saute for 2 mins. Adding idli podi is optional. If you want to have it plain, just omit it.
Garnish with grated coconut and switch off. Serve with some hot tea for a snack.