Preheat oven to 350° F. Lightly grease a 9-inch circle in the center of a baking sheet. In a medium mixing bowl, combine the flour, 1/4 cup sugar, baking powder, and salt. Using a pastry blender or two knives, cut the butter into the flour mixture until mixture resembles coarse meal. Make a well in the center of the dry ingredients and add eggs, orange juice, vanilla, and orange peel. Stir just until dry ingredients are moistened. Stir in chocolate chips and pecans. Pat the dough into a 9-inch circle in the center of the baking sheet. Combine egg yolk and water and brush over dough. Sprinkle with 1 Tablespoon sugar. Using a serrated knife, cut dough into eight wedges, but do not separate. Bake 20 to 25 minutes or until a tooth pick inserted in center comes out clean. Cool on wire rack. Store in airtight container. Serve warm or at room temperature.