Place all the ingredients into a heavy stockpot set on medium low heat. As the plums warm and release their juices, stir well. Cover and simmer for an hour, stirring the mixture periodically. The plums, onions, and red bell pepper bits will soften and meld into a thick barbecue sauce.
Recipe courtesy of Nancy Vienneau and the Third Thursday Potluck.
A delightful combination of colorful tropical fresh fruit and raspberries take homemade shortcakes beyond the usual strawberries. For an extra kick of tropical flavor, sprinkle with chopped macadamia nuts.