A few days ago, I made Plum-Peach. I bought a variety of plums and pluots at the grocery, cooked them down with skins on, then ran them through a food mill to remove skins. Then, added finely chopped fresh peaches to make the amount of fruit needed for the jam recipe. I've made plum-nectarine in the past too, as well as plum-peach-pineapple by adding a half cup to cup of canned crushed pineapple in it's own juice (drained). Peach-pineapple is always good too! I rarely make just one fruit anymore - combining them is so much more interesting!