Without indulging in a Sadhya, what really is Onam? A staple of Onam celebrations in Kerala and around the world is the iconic thali, which is typically served on a banana leaf. Everyone is piqued by the alluring smell of the vegetarian treats that have been abundantly put out on gleaming banana leaves. The Sadhya consists of a multi-course, traditional vegetarian supper with around 25 dishes served on a banana leaf on the occasion of Onam. But have you ever wondered why individuals use a banana leaf instead of a plate while they eat?