Cook over medium heat, stirring occasionally at first and then more often as mixture thickens. As the mixture thickens it’s more likely to scorch, and you don’t want that to happen. Burnt jam won’t taste very good. To prevent this, keep stirring until most of the liquid evaporates and mixture is thickened, 30–40 minutes. I recommend having your kiddos take turns with the stirring, or you can just keep switching hands so you get an even workout on each bicep. Jam out to some tunes while you stir.