This recipe for 2-ingredient Plum Jam is like capturing the fresh flavors of summer in a jar! Plums and sugar is all you need to make this pot of deliciousness. I cook down the sweet and tart plums with sugar, which helps them release their juices and natural sweetness. I cook it till it reaches a thick, spreadable jam-like consistency! This flavorful, sweet and slightly tart jam is one of my favorite things about summer!