Preparation Mix flour, 6 tablespoons powdered sugar, 2 1/2 teaspoons orange peel and salt in processor. Add butter; process until mixture resembles coarse meal. Whisk egg yolk and 2 tablespoons orange juice in small bowl. Add to processor; blend until moist clumps form, adding more juice by teaspoonfuls if dry. Gather dough into ball; flatten into disk. Chill 30 minutes. Butter eighteen 1 3/4-inch-diameter mini muffin cups. Mix mincemeat, crystallized ginger, cinnamon, remaining 4 tablespoons powdered sugar and 3/4 teaspoon peel in small bowl. Roll out dough on floured surface to 17-inch round. Using 2 1/2-inch-diameter cookie cutter, cut out 18 dough rounds. Press 1 round into bottom and up sides of each muffin cup. Using 1 3/4- to 2-inch-diameter cookie cutter, cut out 18 more dough rounds (reroll dough if necessary). Fill crust in each muffin cup with 1 heaping teaspoon filling. Brush edges of smaller dough rounds with some of egg glaze. Place 1 round atop filling in each muffin cup, glazed side down, pressing dough edges to seal. Cut small X in center of each pie. (Can be made 4 hours ahead. Cover pies and remaining glaze separately and chill.) Preheat oven to 375°F. Brush pies with remaining egg glaze. Bake until crusts are golden, about 20 minutes. Using small knife, cut around pies to loosen; turn out onto rack. Serve warm or at room temperature.
Preparation Mix flour, 6 tablespoons powdered sugar, 2 1/2 teaspoons orange peel and salt in processor. Add butter; process until mixture resembles coarse meal. Whisk egg yolk and 2 tablespoons orange juice in small bowl. Add to processor; blend until moist clumps form, adding more juice by teaspoonfuls if dry. Gather dough into ball; flatten into disk. Chill 30 minutes. Butter eighteen 1 3/4-inch-diameter mini muffin cups. Mix mincemeat, crystallized ginger, cinnamon, remaining 4 tablespoons powdered sugar and 3/4 teaspoon peel in small bowl. Roll out dough on floured surface to 17-inch round. Using 2 1/2-inch-diameter cookie cutter, cut out 18 dough rounds. Press 1 round into bottom and up sides of each muffin cup. Using 1 3/4- to 2-inch-diameter cookie cutter, cut out 18 more dough rounds (reroll dough if necessary). Fill crust in each muffin cup with 1 heaping teaspoon filling. Brush edges of smaller dough rounds with some of egg glaze. Place 1 round atop filling in each muffin cup, glazed side down, pressing dough edges to seal. Cut small X in center of each pie. (Can be made 4 hours ahead. Cover pies and remaining glaze separately and chill.) Preheat oven to 375°F. Brush pies with remaining egg glaze. Bake until crusts are golden, about 20 minutes. Using small knife, cut around pies to loosen; turn out onto rack. Serve warm or at room temperature.