The old-fashioned doughnut is a variety of cake doughnut prepared in the shape of a ring with tapered edges around it. Primary ingredients include flour, sugar, eggs, sour cream or buttermilk and leavener. It is typically deep fried, may have a crunchier or crisper texture compared to other styles of cake doughnuts, and have cracks and pores on its surface. After being fried, it may be glazed, dusted with sugar, or served plain. Commercially prepared old-fashioned doughnuts may be prepared using a batter mix that is made with the addition of water. Such mixes are used by some doughnut shops. Some variations are prepared using unique ingredients, and some are produced as doughnut holes.