Preheat your oven to 350°F (180°C). Grease and lightly flour a 9-inch (22 cm) cake pan.
In a large mixing bowl, whisk together the flour, ground poppy seeds, and baking powder.
In another bowl, cream together the softened butter, granulated sugar, and vanilla sugar until light and fluffy.
Add the eggs one at a time to the butter mixture, mixing well after each addition to keep the batter light.
Alternately add the dry ingredients and the milk to the butter-egg mixture, mixing continuously until just combined. Be careful not to overmix.
Pour the batter into the prepared cake pan and spread evenly with a spatula.
Bake in the preheated oven for approximately 40-45 minutes, or until a wooden skewer inserted into the center comes out clean.
Once baked, let the cake cool completely. Then, slice it in half horizontally, spread the bottom layer with apricot jam, and drizzle with rum.
In a small bowl, combine the powdered sugar, lemon juice, punch flavoring, and food coloring to create a thick, pink glaze.
Pour the glaze over the top of the cake, and spread evenly with a spatula.
Let the cake stand for at least 1 hour to allow the glaze to set before slicing and serving.
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