Avial is a dish that is very common in Kerala as well as Tamil cuisine and Udupi cuisine. It is a thick mixture of vegetables and coconut, seasoned with coconut oil and curry leaves. Avial is considered an essential part of the Sadya, the Keralite vegetarian feast.
It is supposed to have been invented by Bhima (one of the Pandava brothers) during their exile. According to the legend, when Ballav (Bhima's name during this time) assumed his duties as the cook in the kitchen of Virata, he did not know how to cook. One of the first things he did was to chop up many different vegetables, boil them together and top the dish with grated coconut. -Source: Wikipedia