Streuselkuchen (crumb cake) is a German specialty. Traditionally it is made of a yeast dough covered with a sweet crumb topping referred to as streusel. The main ingredients for the crumbs are sugar, fat and flour, which are mixed at a 1:1:2 ratio.
The recipe allegedly originated from Silesia, a province that is nowadays in Western Poland, but the cake is found everywhere today. Many variants are prepared, with fillings such as creme and fruits, or using a shortening-based dough.