Undoubtedly one of the unique products of Cape Cod, beach plums grow on bushes in the sand dunes around the Cape.This unique treat comes in a 10 ounce jar and is made in small batches from beach plums, sugar, pectin and citric acid. There are also a wide variety of other delicious Cape Cod produced jams and jellies also available at The Brewster Store and listed in this section of our web site. There is a minimum purchase of three jars.