Easy German Apple Streusel Pie

Ingredients

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• 1 ½ cups all-purpose flour
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• 1 teaspoon baking powder
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• ½ cup butter, softened
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• ½ cup white sugar
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• 2 large eggs, separated
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• 1 ½ teaspoons grated lemon zest
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• ½ cup white sugar
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• 2 teaspoons cornstarch
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• 2 ¼ cups red currants
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Instructions

1. 1
   Make the dough: Sift flour and baking powder into a medium bowl. Mix in butter, sugar, egg yolks, and lemon zest until a dough forms. Cover and let rest in a cool place for 30 minutes. Set egg whites aside for the filling.
2. 2
   Preheat the oven to 325 degrees F (165 degrees C). Grease the bottom and sides of a 10-inch springform pan.
3. 3
   Roll dough into a 10-inch circle; place into the prepared springform pan.
4. 4
   Bake in the preheated oven until golden, about 25 minutes.
5. 5
   Meanwhile, make the filling: Beat reserved egg whites in a glass, metal, or ceramic bowl until stiff. Gradually mix in sugar and cornstarch, then beat for 5 minutes. Fold in currants, then pour over crust in the springform pan.
6. 6
   Return to the oven and bake until top is lightly browned, about 10 minutes. Cool to room temperature before serving.