A Swiss roll or jelly roll (or cream roll when so filled) is a type of sponge cake roll. The steps to make this cake is, first, make a thin layer of the cake using flour, eggs, and sugar and baked in a very shallow rectangular baking tray, called a sheet pan. The cake is removed from the pan and spread with jam or buttercream, rolled up, and served in round cross-sectional slices. The origin of the cake is in Central Europe, but not in Switzerland as the name would suggest. The shape of the Swiss roll has inspired an image, such as a blues music.