A turnover is a pastry made by placing a sweet or savoury filling on a round or square of dough, folding the dough over, sealing the edges, and baking or frying it. Apple turnovers with their flaky, glazed triangles are the classic sweet version; savoury turnovers hold meat, cheese, or vegetables much like a Cornish pasty or empanada. The sealed half-moon shape keeps the filling contained and makes the pastry portable — it is hand food by design. Success depends on a filling that is not too wet, edges sealed firmly so they do not burst, and pastry rolled evenly so it cooks through. They are bakery staples because they are simple, versatile, and easy to eat.