This recipe is adapted from one in top pot hand-forged doughnuts: secrets and recipes for the home baker. Old-fashioned doughnuts are fried at a lower temperature than other doughnuts and turned twice while frying, which gives them their characteristic crunchy petals and groovesperfect for holding onto a sweet glaze (recipe included below). The sour cream in the dough keeps these doughnuts wonderfully moist.