Chilled Grape Soup

Name: Chilled Grape Soup
Ingredients: 1 (2-inch) cinnamon stick; 2 whole cloves; 10 black peppercorns; 2 (2- by 1-inch) strips fresh lemon zest; 2 (2- by 1-inch) strips fresh orange zest; 1/2 teaspoon unflavored gelatin (from one 1/4-oz envelope); 1 1/2 cups plus 1 tablespoon white grape juice; 1 cup dry white wine; 1/2 cup sugar; Pinch of freshly grated nutmeg; 1 teaspoon finely grated fresh lemon zest; 2 cups mixed grapes, stemmed, seeded if necessary, and sliced (lengthwise or crosswise); a 5-inch square of cheesecloth; kitchen string