After fermentation, the batter will be light and airy. Give it a gentle stir to mix well. Grease the idli plates with a little oil or ghee to prevent sticking. Pour spoonfuls of the batter into each cavity of the idli plates, filling them about 3/4 full. Do not overfill, as the idlis will expand during steaming. Place the idli plates in the steamer or pressure cooker. If using a pressure cooker, remove the whistle/weight from the lid to avoid excess pressure build-up. Steam the idlis on medium heat for 10-15 minutes, or until they are cooked through. To check for doneness, insert a toothpick or knife into the center of an idli – if it comes out clean, the idlis are ready. Once cooked, remove the idli plates from the steamer and allow them to cool for a few minutes. Use a spoon or spatula to gently remove the idlis from the molds. Serve hot with coconut chutney, sambar, or any other accompaniment of your choice.