In the work bowl of a food processor, pulse walnut halves with ¼ cup sugar until walnuts are finely ground. Add flour; pulse until combined.
In a large bowl, beat butter and remaining ¼ cup sugar with a mixer at medium speed until pale. Add eggs and vanilla extract, beating until smooth. Beat in flour mixture, and pour into prepared Flaky Tart Dough.
Peel, halve, and core pears. Cut into ¼-inch-thick slices, and arrange over filling.
Bake until filling is golden brown and set, 35 to 40 minutes. Let cool in pan completely before serving.
Recipe by Victoria at https://victoriamag.com/pear-frangipane-tart-recipe/