John Besh of Restaurant August in New Orleans serves this lightly sweet, fruity white-wine sangria over plenty of ice cubes. "Use Viognier—it has a nice balance of fruit and acidity," he says.
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In a saucepan, cook the sugar and water until the sugar dissolves; transfer to a pitcher and refrigerate until cold. Stir in the Grand Marnier, Viognier, mango, peaches and mint and serve over ice.