World Idli Day!World Idli Day 2022: E. Eniyavan Who Makes 2547 Unique Varieties of Idlis!!Therefore March 30th is the occasion to celebrate World Idli Day! Idli is a type of savory rice cake from the Indian continent, popular as a breakfast food in both Southern India and Sri Lanka. The cakes are made by steaming a batter consisting of rice and fermented black lentils.