Makes 1 quart of jam
2 1/2 tsp. Pomona’s Pectin Powder*
2 1/2 tsp. Pomona’s calcium water*
1 cup sugar
1, 18 oz. package fresh blackberries
Zest & juice of 1 lime
1 1/3 cups unsweetened berry juice
¼ cup Persian Lime olive oil (or 1 Tbs. butter)
Preparing the Jars
Wash & rinse jars. Put in a large pot with water to cover. Bring to a boil & turn off heat. Process the lids & rings according to manufacturer’s directions. At the point you are ready to fill, remove jars from the water & briefly drain on a clean towel or dish rack.
Combine pectin powder & ½ cup sugar. Set aside. Wash berries & coarsely mash in a heavy saucepan. Add berry juice, lime juice & zest, remaining sugar, calcium water & olive oil to crushed berries. Bring to a brisk boil over high heat, stirring often. Add sugar/pectin powder & stir quickly to combine. Bring back to a boil for 1-2 minutes stirring constantly.
Pour hot jam into clean jam jars leaving ¼” – ½” space at the top. Screw on two-piece lids. Put jam-filled jars in boiling water to cover by 1 inch. Boil for 5 minutes, adding an additional minute for every 1,000 feet above sea level. Remove from water & let jars cool. Check the seals as the jars cool. The lids must be sucked down when fully cool. Apply gentle pressure to the lid to ensure a good seal. Jam lasts approximately 3 weeks refrigerated once opened.
*The pectin powder & calcium powder are sold together in the box of Pomona’s Universal Pectin. Pectin labeled “for less or no sugar needed” can be used instead.