Bring to a boil on medium heat, then slow boil one hour to thicken, stirring, use wooden spoon to scrape the bottom well. When thickening, do drop tests after 50 minutes: drip mixture from spoon on cold plate, angle, if it does not run, mixture is done. Below, right side fails, left side passes, 50 and 55 minutes.Remove from heat. Do not let mixture turn brown.

Working quickly, fill each sterilized pint jar with two cups of hot marmelade, leave fingertip airspace, close, set upside down to cool overnight. Do not touch. If lid has not curved inward when cooled, put in fridge, eat within a month. If lid has popped inward, store in dark place. Enjoy!