Vinho Verde is a white or red wine from the northwestern part of Portugal. The name means "green wine," which refers to its youthfulness.
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Using a knife, peel the oranges, removing all of the white pith. Working over a bowl, cut in between the membranes to release the sections into the bowl.
In a punch bowl, mix the wine and Rosemary Syrup. Add the oranges and cucumber slices; let stand for 1 hour. Garnish with the mint and serve over ice.