Oranges Poached in Riesling and Rosemary Syrup

Name: Oranges Poached in Riesling and Rosemary Syrup
Yield: 4 Servings
Ingredients: 1 750-ml bottle Johannisberg Riesling; 2/3 cup sugar; 4 navel oranges, peel and white pith removed, oranges cut crosswise in half; 2 3x1/2-inch strips orange peel (orange part only), cut into slivers; 1 teaspoon fresh whole rosemary leaves (stripped from stems)