Measure all ingredients except cream into blender container. Cover and blend on medium speed for about 4 minutes. Add cream to container; cover and blend on medium for another 5 seconds. Strain; then refrigerate until cold. Pour into chilled punch cups. Serves 6, about ¾ cup each.
Recipe by The Culinary Cellar at https://theculinarycellar.com/sphere-magazine-december-1975/