Use this to make our Pear Tart.
Preheat oven to 350 degrees. Spread the almonds in a single layer on a rimmed baking sheet; toast in oven until light golden and fragrant, seven to 10 minutes. Let cool completely, then finely grind in a food processor. Set aside.
In a small bowl, whisk together flour, baking soda, and salt; set aside. In the bowl of an electric mixer fitted with the paddle attachment, cream butter and sugar until smooth and light, about one minute. Add almonds, egg yolk, and extract, and beat on medium speed until well combined. With mixer on low speed, gradually add flour mixture, beating until just combined to form a dough. Turn out onto a piece of plastic wrap; pat into a flattened rectangle. Wrap, and refrigerate until firm, at least one hour or overnight.
Reheat oven to 350 degrees. On a work surface that is lightly floured, roll out dough to a six-by-16-inch rectangle, about 3/8 inch thick. Fit into a four-by-13-inch rectangular tart pan with a removable bottom. Trim flush with edge of pan. Prick bottom of dough all over with a fork. Chill until firm, about 15 minutes.
Place tart pan on a baking sheet; bake until crust starts to brown around the edges, 13 to 14 minutes. (Dough will be slightly puffed in spots.) Transfer to a wire rack. Using a metal spatula, gently press on dough until it is smooth and flat. Let cool completely.