Combine ingredients in a heavy skillet. Cook over medium-low heat, stirring constantly, until it will not run together when a spoon is drawn through. Please note, use a skillet, not a pot, you need the larger surface area to help with the evaporation and reduction process. Also be sure to stir constantly because it will scorch if you don't.
I spoon it into clean, dry freezer jam jars, leaving headspace and then freeze.