Process shortbread cookies in a food processor until very fine. Add butter and pulse until evenly moistened.
1 cup shortbread cookies, 3 tablespoons unsalted butter
Spoon crumbs into tart pan. Press up the sides using the flat edge of a measuring cup, about ¼" thick. Press remaining crumbs into the bottom.
Chill crust in the refrigerator while preparing the frangipane.
In the food processor, blend almond paste and sugar until broken apart. Add butter, then mix in egg, flour, salt, and almond extract. Process until light and fluffy.
⅓ cup almond paste, 1 teaspoon granulated sugar, 2 tablespoons unsalted butter, 1 tablespoon flour, 1 large egg, pinch kosher salt, ½ teaspoon almond extract
Peel, core, and thinly slice pears (about ⅛–¼" thick).
3 large pears
Spread frangipane over the chilled crust with a light hand. Fan pear slices slightly and use a mini offset spatula to place them on top. Repeat with remaining pears. Sprinkle with sliced almonds and turbinado sugar.
1/4 cup sliced almonds, 1 tablespoon turbinado sugar
Bake at 375°F for 30–35 minutes, until pears have some color and the tart shell edges are golden brown. Cool on a wire rack.
While tart bakes, warm apricot jam, lemon peel, vanilla extract, and Riesling in a small saucepan over medium heat, stirring constantly for 5–8 minutes until thickened.
¼ cup apricot jam, ½ teaspoon vanilla extract, 3- inch peel of lemon, 2 tablespoons Reisling wine
Once tart is out of the oven, brush pears with the glaze. Cool completely before slicing. Dust with powdered sugar or a drizzle of cream if desired.
Confectioners' sugar, heavy cream