Desserts are a part of the Diwali celebration. A favorite at our house is halwa. It is all things to all people, this dessert--a pudding or a fudge. In some recipes, it's based on semolina, like the southern version called Kesari, and has a texture like gelatin. Other versions use carrots or mung beans.Tirunelveli halwa is in a class by itself, with its red color and unusual aroma.