Each of these tartlets is a miniature still life featuring a smattering of sun-ripenedberries.
Divide dough in half. On a lightly floured surface, roll out 1 piece to 1/8 inch thick. (Keep remaining dough refrigerated.) Using a 3-inch round cookie cutter, cut out 8 rounds. Gently press into eight 2 1/2-inch round tart pans. Trim dough flush with top edge of pans. Refrigerate until cold, about 30 minutes.
Preheat oven to 375 degrees. Line tart shells with parchment, and fill with pie weights or dried beans. Bake until edges are golden, 12 to 14 minutes. Remove parchment and weights; continue baking until surfaces are golden, about 10 minutes. Let cool on a wire rack. Repeat process with remaining dough.
Remove tart shells from pans; spoon 2 teaspoons pastry cream into each. Top with berries. Refrigerate until ready to serve. Top with berry leaves, if desired.