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The kringles were created by German bakers from Austria who introduced their method of rolling butter between layers of yeast dough and letting it rest for hours before baking. When Danish bakers in Copenhagen went on strike, the bakery owners fired them and hired replacements from Austria. Once the Danish bakers returned to their jobs, they continued to make dough the Austrian way.
It’s the shape of a kringle (pretzel-shaped) in Denmark, which is the Danish sign for a bakery (hence the name kringle). Outside every bakery in Denmark, you will find a sign with a kringle on it. A kringle is not only the dough, as it can be made of different types of dough. However the shape is all important. If it is not pretzel shaped, they will call the cake something else even if it is made the same way.