In a large pot place the grapes, vanilla bean, and bouquet garni made from the cinnamon, anise, and zests. Add the citrus juices, spring water, and cranberry juice, and bring to a boil. Simmer 10 minutes. Remove bouquet garni and puree. Strain through a china cap then a chinoise. Add the champagne then season with simple syrup to taste. Chill. Sprinkle bowls with pomegranate seeds and pour soup over.