INGREDIENTS – 300 g flour, 150 g butter, 100 g powdered sugar, lemon zest, vanilla, a pinch of salt, 2 egg yolks, 1 whole egg, 1 tablespoon sour cream. Place the flour, sugar, butter, vanilla, lemon zest, and salt on a work surface. Rub everything together with your palms until crumbly. Make a well in…