These scones are crisp and golden with a light, flaky interior. The fruit offers a slightly chewy contrast. Orange zest and Grand Marnier flavor the scones. Serve them with butter and tea.
Stir together candied orange peel, raisins, orange zest, and liqueur in a small bowl. Cover with plastic wrap, and refrigerate for 1 day.
Preheat oven to 350 degrees. Whisk flours together in a large bowl. Transfer half to a food processor, and add butter. Pulse to cut in butter (the largest pieces should be the size of small peas). Add granulated sugar, baking powder, and 1 teaspoon salt to remaining flour in bowl; whisk to combine. With a pastry blender or your fingertips, work in flour-butter mixture until mixture resembles coarse meal.
Whisk together cream, whole egg, and egg yolk. Make a well in the center of flour mixture, and pour in half of cream mixture. Draw dry ingredients over wet ingredients with a rubber spatula, scraping bottom of bowl to incorporate all dry crumbs. Add remaining cream mixture, and gently mix just until incorporated (do not overwork dough).
Turn out dough onto a lightly floured work surface, and press dough into a 6-by-9-inch rectangle. Sprinkle dried-fruit mixture evenly over dough. With a short side facing you, fold rectangle into thirds, as you would a letter. Rotate dough a quarter-turn clockwise. Roll out dough to a 6-by-9-inch rectangle, folding and rotating once more.
Pat dough into a 1 1/4-inch-thick rectangle with floured hands, and cut out as many rounds as possible with a floured 2-inch round biscuit cutter. Gather scraps, reroll once, and cut out more rounds (you should have a total of 16).
Place scones 2 inches apart on parchment-lined baking sheets. Lightly beat egg white, and brush tops; sprinkle with sanding sugar. Bake until golden brown, about 25 minutes, rotating sheets halfway through. Let cool on sheets. Serve warm or at room temperature.
Scones keep, wrapped in plastic, for 1 day.