Combine ingredients in a large non-reactive pot and bring to a boil.
Boil until mixture thickens and gels.
To test for gel point: As the jam begins to thicken, pour a little of the liquid onto the frozen spoon to quickly cool it. Pour the cooled jam back into the pot. If the jam pours off the spoon in a sheet, as opposed to dripping off in globs, it is done. Keep cooking and testing as needed.
Store in refrigerator or seal in mason jars in a waterbath canner.