Combine peaches and lemon juice in a blender container or food processor bowl. Cover and blend or process till smooth.
Stir together sugar and boiling water in a large mixing bowl till sugar dissolves. Stir in peach mixture, wine, and orange peel. Pour into a 9x9x2-inch baking pan.
Cover and freeze for 3 to 4 hours or till firm. Break into chunks; transfer to a chilled large mixing bowl. Beat with an electric mixer on medium to high speed till smooth. Return to pan; cover. Freeze for several hours or till firm.
To serve, let stand at room temperature for 20 minutes. Scoop into dessert dishes. Garnish with mint, if you like. Makes 8 servings.