A doughnut (also spelled "donut"), is a sweet, deep-fried piece of dough or batter. The two most common types are the torus-shaped ring doughnut and the filled doughnut, a flattened sphere injected with jam, jelly, cream, custard, or other sweet filling. A small spherical piece of dough, originally made from the middle of a ring doughnut, may be cooked as a doughnut hole. Baked doughnuts are a variation that is baked in an oven instead of being deep fried.
Ring doughnuts are formed either by joining the ends of a long, skinny piece of dough into a ring or by using a doughnut cutter, which simultaneously cuts the outside and inside shape, leaving a doughnut-shaped piece of dough and a doughnut hole from dough removed from the center. This smaller piece of dough can be cooked or re-added to the batch to make more doughnuts. A disk-shaped doughnut can also be stretched and pinched into a torus until the center breaks to form a hole. Alternatively, a doughnut depositor can be used to place a circle of liquid dough directly into the fryer. Doughnuts can be made from a yeast-based dough for raised doughnuts or a special type of cake batter. Yeast-raised doughnuts contain about 25% oil by weight, whereas cake doughnuts' oil content is around 20%, but they have extra fat included in the batter before frying. Cake doughnuts are fried for about 90 seconds at approximately 190°C to 198°C, turning once. Yeast-raised doughnuts absorb more oil because they take longer to fry, about 150 seconds, at 182°C to 190°C. Cake doughnuts typically weigh between 24 g and 28 g, whereas yeast-raised doughnuts average 38g and are generally larger when finished.
