Plum sauce is a thick sweet-and-sour sauce made form plums, apricots and sugar. Also called duck sauce, it's commonly served with duck, as well as with pork and spareribs. Hoisin is a sweet-spicy sauce made from soybeans, garlic and chilies. Look for the sauces in the Asian food section of the supermarket.
Try this sauce over frozen cooked meatballs instead of over homemade ones. Combine one 1-pound package of frozen meatballs and the sauce in a slow cooker; set it on Low and heat them for 4 to 5 hours.
To easily shape uniform meatballs, first divide the meat mixture into 36 equal 1-tablespoon portions. Moisten your hands and roll each portion into a smooth ball.