The dough is stretched so thin before frying that it blisters into paper-crisp bubbles rather than puffing up soft like a doughnut.
A thin, only lightly sweetened dough is stretched or rolled paper-thin, deep-fried until it bubbles and crisps, then dusted heavily with powdered sugar. Basel street vendors sell them warm during Fasnacht season, a crunchy counterpart to the hearty Mehlsuppe.