Sugar plums,available in high summer, aresweet and small; they'rehalved and baked on almondfrangipane in a rich patesablee.
Press dough into a 10-inch round tart pan with a removable bottom. Refrigerate 10 minutes. Trim dough flush with top edge of pan. Refrigerate until cold, about 30 minutes.
Preheat oven to 350 degrees. Line tart shell with parchment, and fill with pie weights or dried beans. Bake until edges are golden, about 10 minutes. Remove parchment and weights; continue baking until surface is golden, about 10 minutes. Let cool on a wire rack.
Spread frangipane in shell. Arrange plums, cut sides up, on top in concentric circles, pressing gently. Sprinkle with turbinado sugar. Bake until golden, 45 to 50 minutes. Let cool on a wire rack. Just before serving, dust tart with confectioners' sugar.