2 teaspoons calcium water (included with Pomona’s Universal Pectin)
Instructions
In a small bowl, mix together sugar or honey and pectin powder. Don’t skip this step, or your pectin will clump. Set aside.
In a large, non-reactive pot (I use a heavy bottom stainless steel pot), combine pears, blueberries, lemon juice and the calcium water. Bring to a full boil.
Add honey-pectin or sugar-pectin mixture, stir vigorously 1-2 minutes while cooking to dissolve pectin. Return to boil and remove from heat. Stir in vanilla extract.
Ladle jam into sterilized jars leaving 1/4″ headspace. Wipe rims clean and screw on the lids. Process for 10 minutes in water bath canner (add 1 minute for every 1,000 feet above sea level).
Remove jars from canner and allow to cool completely. Remove canning rings, wipe down lids if needed, date and label. Store in a cool, dry location out of direct sunlight. Best quality if used within 18 months. Jam will last about three weeks once opened.