Archaeological evidence suggests that pancakes are probably the earliest and most widespread cereal food eaten in prehistoric societies.[2] The pancake's shape and structure varies worldwide. A crêpe is a thin Breton pancake cooked on one or both sides in a special pan or crepe maker to achieve a lacelike network of fine bubbles. A well-known variation originating in Southeast Europe is Palačinke, a thin moist pancake fried on both sides and filled with jam, cheese cream, chocolate, or ground walnuts, but many other fillings, both sweet or savoury, can also be used.