METHOD
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make the dough
Add flour, sugar, baking powder, butter (cut into cubes), and eggs to a bowl. Knead the butter into the flour mixture until no lumps or chunks of butter are left. Place in the fridge for 20 - 30 minutes.
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make the poppyseed filling
Add milk, sugar and butter (cut into cubes) to a saucepan. Place over medium heat and bring to a boil. Add the ground poppy seeds and stir into the mixture. Add the semolina and cook over low heat for 3 - 4 minutes while stirring regularly. Set aside and stir in the whipping cream, rum, lemon zest, and sour cream. Stir to combine, set aside and bring to room temperature.
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poppyseed filling
Stir the Graham cracker crumbs into the room-temperature poppyseed filling. When combined, add the eggs and stir to combine.
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dough
Grease a 20 cm x 25 cm (8-inch x 10-inch) cake pan with butter. Sprinkle your working surface with flour. Add two-thirds of the dough on top. Store the rest of the dough in the fridge. Roll the dough into a 20 cm x 25 cm (8-inch x 10-inch) rectangle. Transfer to the prepared cake pan with a rolling pin. Spread the poppyseed filling evenly on top. Grate the rest of the chilled dough on top of the filling. Sprinkle with Graham cracker crumbs.
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German Poppy Seed Cake
Place the German Poppy Seed Cake into a preheated oven. Bake for one hour at 180 °C / 350 °F. When the cake is baked, transfer it to a wire rack to cool, then cut it into slices and serve.