The California grape farmers sent me a press release with a recipe for California Grape Sorbet. I haven't seen black California grapes in my Utah grocery store, but I don't know why you couldn't substitute other seedless grapes.
The recipe calls for 1 tablespoon of vodka, but it's optional. The alcohol helps to make the sorbet smooth. But, again, it's optional.
California Grape Sorbet
4 cups black California seedless grapes, rinsed
1/4 cup sugar
1/2 teaspoon lemon zest
1 tablespoon fresh lemon juice
1 tablespoon Vodka (optional, but helps make sorbet smooth)
Makes 4 servings.
Nutritional analysis per serving: Calories 163; Protein 1 g; Fat 1 g; Calories from Fat 5 %; Carbohydrates 41 g; Cholesterol 0 mg; Fiber 1.6 g; Sodium 3 mg.