In a bowl, combine the flour and sugar, then rub in the butter until it resembles breadcrumbs. Add the egg yolks and knead until a dough forms.
Roll out the dough and use it to line a baking pan. Bake at 350°F (180°C) for 10 minutes.
In a bowl, mix the curd cheese with the vanilla sugar, grated lemon zest, and sour cream. Spread the mixture evenly over the pre-baked crust.
In a clean bowl, whisk the egg whites until stiff peaks form. Gradually add the sugar and continue whisking until you have a glossy meringue.
Spread the apricot jam over the curd cheese layer, then top with the meringue.
Bake at 300°F (150°C) for 15-20 minutes, or until the meringue is golden brown. Let it cool completely before slicing and serving.
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