Red Currant Pie

Step 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.

Step 2
Preheat the oven to 325 degrees F (165 degrees C). Grease the bottom and sides of a 10-inch springform pan.

Step 3
Roll dough into a 10-inch circle; place into the prepared springform pan.

Step 4
Bake in the preheated oven until golden, about 25 minutes.

Step 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.

Step 6
Return to the oven and bake until top is lightly browned, about 10 minutes. Cool to room temperature before serving.