LINZERTORTE

Steps:

• Preheat oven to 350 degrees. Spread hazelnuts in a single layer on a rimmed baking sheet; toast, stirring occasionally, until skins begin to split, about 15 minutes. Immediately rub hazelnuts vigorously in a clean kitchen towel to remove skins (as much as will come off easily). Let cool.
• In a food processor, pulse hazelnuts and almonds until finely ground. (Be careful not to overprocess; you don't want the mixture to become a paste.) In a medium bowl, whisk together flour, baking powder, cinnamon, salt, and nut mixture; set aside.
• In bowl of an electric mixer fitted with the paddle attachment, beat butter and granulated sugar until light and fluffy, about 3 minutes. Add egg yolk and beat 1 minute to combine. With mixer on low speed, add ground nuts and flour mixture all at once.
• Divide dough in half. Set a 10-inch fluted tart pan with a removable bottom on a parchment-lined baking sheet. Using your fingers, press 1 dough half into tart pan. Chill until firm, about 30 minutes. Meanwhile, roll remaining dough half between 2 sheets of parchment paper lightly dusted with flour to a 12-inch round; place on a baking sheet and chill until firm, about 30 minutes.
• Using an offset spatula, spread jam evenly over chilled dough in tart pan; set aside. Using a fluted pastry wheel, cut 3/4-inch-wide strips from chilled round of dough. Arrange strips on top of jam in a lattice pattern. Freeze until firm, about 30 minutes. Meanwhile, preheat oven to 350 degrees.
• Bake, rotating pan halfway through, until torte is golden brown all over, about 40 minutes. Transfer to a wire rack to cool 20 minutes. Remove ring and cool torte completely. Torte can be kept at room temperature, loosely covered in plastic wrap, for up to 3 days. When ready to serve, dust with confectioners' sugar, if using.