From THE HERBFARM COOKBOOK by Jerry Traunfeld. Copyright ©2000 Buttery, slightly sweet pumpkin is the perfect mate for the briny flavor of oysters, scallops, or other crustaceans. This soup is made with shrimp, whose shells are turned into an aromatic stock that serves as the soup's liquid. Classic shellfish bisques are thickened with rice, but here pumpkin provides body for the soup. Sage's earthy flavor complements both pumpkin and shrimp and steers the focus of flavor from sweet to savory. This is a satisfying soup to prepare throughout the fall. If you serve it as a first course for Thanksgiving dinner, you might start a tradition in your family.