01 - In a large mixing bowl, combine the all-purpose flour, granulated sugar, and salt. Gradually cut in the chilled butter using a pastry blender or your fingertips until the mixture resembles coarse breadcrumbs. Add the egg yolk and ice water, mixing until the dough just comes together. Form the dough into a flat disk, wrap it in plastic film, and chill in the refrigerator for a minimum of 30 minutes.
02 - Preheat your oven to 350°F (175°C). On a lightly floured surface, roll out the chilled pastry dough to fit a 9-inch (23 cm) tart pan. Carefully transfer the dough to the tart pan, pressing it gently into the base and sides. Trim any excess dough from the edges and prick the bottom of the pastry generously with a fork. Chill the prepared tart shell for an additional 10 minutes.
03 - In a medium bowl, cream together the softened unsalted butter and granulated sugar until light and fluffy. Beat in the large egg and vanilla extract until well combined. Gradually stir in the almond flour and all-purpose flour until the mixture is smooth and uniform. Spread this almond cream evenly over the chilled, pricked pastry base in the tart pan.
04 - Core the red apples and slice them in half. Using a mandoline slicer or a very sharp chef's knife, cut the apple halves into very thin, uniform slices, approximately 1–2 millimeters thick.
05 - In a microwave-safe bowl, combine the thinly sliced apples with the lemon juice and 1 tablespoon of water. Microwave on high for 1–2 minutes, or until the apple slices are just flexible and pliable, but not mushy. This makes them easier to shape.
06 - To create the apple roses, select 6–8 of the softened apple slices and overlap them in a long, continuous row. Gently roll them up from one end to form a tight, rose-like shape. Carefully place each apple rose onto the almond cream filling, pressing lightly to secure it. Repeat this process, arranging the apple roses concentrically, until the entire tart surface is adorned with the apple roses.
07 - In a small saucepan or microwave-safe bowl, gently warm the apricot jam with 1 tablespoon of water until it is liquefied and smooth. Using a pastry brush, liberally brush the warm apricot glaze over all the apple roses for a beautiful shine. If desired, sprinkle the tart with additional granulated sugar for a hint of sparkle and sweetness.
08 - Bake the tart in the preheated oven for 35–40 minutes, or until the pastry crust is golden brown and the apple slices are tender. The almond cream should be set. Allow the tart to cool completely on a wire rack before carefully removing it from the tart pan. This tart can be served slightly warm or at room temperature.