2 large oranges, 1 cut into ¼-inch-thick slices, the other 1 juiced
1 large lemon, cut into ¼-inch-thick slices
¼ cup granulated sugar
2 tablespoons Grand Marnier (or other orange-flavored liquor, i.e. Triple Sec or Cointreau)
1 (750-mL) bottle white wine (Pinot Grigio or Chardonnay, preferably), chilled
6 to 8 ice cubes
1. Add orange and lemon slices and sugar to a large pitcher; mash gently with a wooden spoon until the sugar dissolves and the fruit releases some juice but is not completely crushed, about 1 minute. Stir in orange juice, liquor and wine. Refrigerate at least 2 hours (up to 8 hours).
2. Before serving, add ice cubes and stir briskly to redistribute settled fruit and pulp; serve immediately.