My dad used to make plum liquor -- plums, sugar, and vodka, rum, or ...one other I can't remember made from sweet potatoes. We had a tasting party and decided the one made with rum was best.
When my girls were little, I layered the plums with sugar until all the liquid came out of the plums, but before the stuff started to ferment. The plums would shrivel up into prune-like form. We made beverage from the syrup (with water or sparkling/carbonated water) and they ate the "prunes" like candy. I wanted to make jelly, but the girls drank up all the syrup