In a saucepan, combine 1 cup sugar, 1 1/4 cups orange juice, grated zest of 1 orange and, if desired, 1 tsp. cinnamon. Warm until sugar dissolves. Add 12 oz. fresh cranberries and bring to a boil. Reduce heat and simmer for 5 minutes. Cool, cover and refrigerate until ready to serve. Serves 10.