Wash the strawberries in cool, running water and drain. Remove the stems and hulls. Crush the berries, one layer at a time, with a potato masher. Measure out the required amount of fruit.
Sprinkle the Ball Jam Setting Mix with Pectin evenly over the bottom of the Bell Automatic Jam & Jelly Maker pot fitted with the stirrer. Add the crushed strawberries and the balsamic vinegar evenly over the pectin. Add the butter to reduce foaming.
Press the JAM button - the cook time will automatically default to 21 minutes. Press ENTER to begin cooking. In 4 minutes the appliance will emit 4 short beeps indicating that it is time to add the sugar.
Add the sugar gradually while the stirrer continues turning. Place the glass lid on the pot. The appliance will continue to automatically stir the ingredients while it cooks. Stay within hearing/close proximity of the Jam & Jelly Maker while it cooks. The appliance will beep at the end of the process signalling that the cooking is complete. Press CANCEL and immediately remove the glass lid and unplug the appliance.
Remove the stirrer with an oven mitt. Skim foam, if needed, from the top of the jam.
Spoon the hot jam into hot sterilized glass jars and seal.
Recipe from the Ball Automatic Jam & Jelly Maker Sweet & Simple recipe booklet.
Mum of three, daydream adventurer, OU Life Sciences graduate, occasional crafter, ex-pat Canadian & quite possibly Britain's most northerly food blogger.