Puree grapes in food processor or blender.
Strain grape puree through a fine-mesh sieve set over a 13x9-inch baking dish, pressing solids with the back of a large spoon. Discard peel.
Add champagne, sugar, and lemon juice, and slowly stir until sugar dissolves.
Cover with plastic wrap and freeze for 3 to 4 hours, or until frozen, stirring every hour.
Remove and scrape with a fork until fluffy.
Scoop into serving bowls and garnish with grapes.
Calories: 78 kcal | Carbohydrates: 18 g | Protein: 0 g | Fat: 0 g | Saturated Fat: 0 g | Cholesterol: 0 mg | Sodium: 2 mg | Potassium: 161 mg | Fiber: 0 g | Sugar: 16 g | Vitamin A: 50 IU | Vitamin C: 4.4 mg | Calcium: 9 mg | Iron: 0.3 mg | Net Carbs: 18 g
Nutritional info is an estimate and provided as courtesy. Values may vary according to the ingredients and tools used. Please use your preferred nutritional calculator for more detailed info.