Once the water in the steamer is boiling, place the plates/ moulds with the batter in, cover and let it steam cook for about 10 to 15 minutes. Over steaming can make the Idlis less soft. Take the plates/ moulds out and let them cool a bit, for about 10 to 15 minutes. Run the edge of a butter knife or spatula around each Idli and loosen it (it will not loosen neatly if it is still very hot). Unmould and transfer to a serving dish. Serve the Idlis slightly warm, with Sambar, Coconut Chutney or Milagaipodi (chutney powder).