Streuselkueche

Combine 160g milk, 18g yeast, 60g sugar, 55g egg, 70g butter, 320g flour, and 4g salt to form a smooth dough.

Knead the dough until elastic and allow it to rise in a warm place until doubled in volume.

Mix 180g flour, 110g sugar, 110g butter, 2g cinnamon, and 2g lemon zest until the mixture forms coarse crumbs.