Bolu Gulung - Roll Cake
Bolu Gulung is a Swiss roll or jelly roll, a type of sponge cake roll. This type of cake made of thin cake and jelly. The thin cake is made of eggs, flour and sugar and baked in a very shallow rectangular baking tray. The cake is removed from the pan and spread with jam or buttercream, rolled up, and served in circular slices.
Roll cake originated in Central Europe, but not in Switzerland. It appears to have been invented in the nineteenth century, along with Battenberg, doughnuts and Victoria sponge. It is a traditional German, Hungarian and probably Austrian type of cake. The shape of the Swiss roll has inspired usage of the term as a descriptive term in other fields, such as in optics.