Chettinad Idli is a popular South Indian breakfast dish made with fermented rice and lentil batter. The batter is made by grinding soaked rice and urad dal together and allowing it to ferment overnight. The fermented batter is then steamed in idli molds to make soft and fluffy idlis. Chettinad idlis are known for their unique flavor, which comes from the addition of spices like black peppercorns, cumin, and fennel seeds to the batter. They are usually served with coconut chutney and sambar.