For the tart dough
1 1/4 cup all-purpose flour
1/4 cup confectioner’s sugar
1 tsp kosher salt
1/2 cup cold unsalted butter cut into 1 inch cubes
1 tsp vanilla
1 egg yolk
4 tsp ice cold water
For the frangipane
¾ cup hazelnuts, toasted with skin removed
1/3 cup granulated sugar
½ tsp almond extract
1/3 cup cold unsalted butter, cut into 1-inch cubes
1 egg
1/2 cup all-purpose flour
1/2 tsp kosher salt
For the tart
4-5 apples
1/4 cup apple jelly
Make the dough. In the bowl of a food processor, blend the flour, sugar and salt. Pulse in the butter until the mixture is coarse and pebbly. In a separate bowl whisk the yolk with vanilla and ice water. With the motor going, stream the liquid into the flour butter mixture. Allow the dough to collect into a ball in the food processor. Remove it and form the dough into a disc. Wrap in plastic and chill minimum 1 hour, or up to 3 days
No need to rinse the food processor bowl. Place hazelnuts with sugar and extract in the bowl of food processor and pulse until mealy. Pulse in butter until smooth. Add in the egg and continue to pulse until a smooth mixture forms, about 30 seconds. Add in flour and salt and pulse until evenly combined. Transfer to a bowl and cover with plastic. Store in the fridge up to 3 days before baking. Let soften to room temperature before using
Lightly dust a work surface and rolling pin with flour. Work the disc of dough with your hands until pliable but still cold. Roll out the dough into a 12-inch circle dusting the surface and the dough as needed to avoid sticking. Transfer the dough into a 9-inch tart pan with removable bottom. If the dough rips, just press and patch to repair. Press dough into the pan and remove and discard any excess scraps.
Dart the surface of the dough several times with a fork. Chill the tart in the refrigerator for 20 min. Meanwhile, Preheat the oven to 350F.
Place the tart on a baking sheet. Grease a 12-inch-long sheet of aluminum foil. Press the foil flush to the dough, bottom and edges. Bake until the edges begin to turn golden, about, 15 minutes. Remove the shell and carefully remove the foil. Return to the oven and bake until light golden, an additional 10 minutes. Let cool completely.
Cut the apples off the core into 4 thick wedges. Using a mandolin, slice the wedges crosswise into thin (1/16-inch) halfmoon shapes. After slicing each wedge, collect and organize the slices into little stacks where the skin is aligned, resembling the same wedge-shape before it was sliced.
Transfer the frangipane into the tart shell and smooth into an even layer using a spatula or the back of a spoon.
Arrange the apple stacks on the frangipane, gently pressing them in so the stacks stand up straight. Arrange the stacks in different directions until the entire surace is covered. Bake until apples are tender and frangipane is baked through, about 45 minutes.
Place the apple jelly in microwave safe bowl and heat just to loosen, about 15 seconds. Alternatively you can gently heat in a small pot over low. Gently brush jelly into a thick glossy layer over the apples.