1750 ml bottle Prosecco, champagne, or sparking white wine
Combine cranberries and cranberry juice in a food processor or blender. Blend until berries are roughly chopped.
In a small saucepan, combine the berry mixture, sugar, and orange juice and zest. Bring to a boil then reduce heat to low. Simmer for 10 minutes, or until syrupy. Using a fine mesh strainer, strain syrup into a small bowl; let cool to room temperature. Do not refrigerate.
Just before serving, add 1 Tablespoon of cranberry syrup to each glass. Top with sparkling wine and serve.