Mummentaart is a traditional Luxembourgish pie or tart filled with a cinnamon-flavored apple filling. The dough is made by combining flour, butter, quark, water, and salt, while the filling typically consists of sliced or cubed slightly sour apples that are sprinkled with sugar, cinnamon, and lemon juice, then mixed with raisins.

A layer of dough is placed inside a baking tin, and it is then covered with the apple filling before being finished with another layer of dough on top, glazed with beaten egg yolks, and baked until nicely colored and done. Slices of this scrumptious apple pie can be enjoyed both warm and chilled, and they are often accompanied by a dollop of whipped cream or fresh fruit on the side.