Neither long simmering nor heat-canned, this vibrant, lightly spiced jam couldn't be simpler to prepare. Red-fleshed plums lend a gorgeous garnet color, but any variety works well.  Ingredients [ingredients] 1/3 cups coarsely chopped Meynard Plums (from about 1 1/4 pounds) 1 (1-inch) piece ginger (about 1 1/2 ounces) 1 1/3 cups sugar 1/4 cup Bal...