3 ½ pounds Concord grapes
½ cup water
7 cups white sugar
1 box pectin
Turn on the heat and mash the grapes to help them release their juice. Grapes are mostly juice, and don’t take much cooking before they completely fall apart. It only takes about 10 minutes before you can turn off the heat.
use a jelly bag or a colander lined with cheesecloth to strain for at least 2 hours, or overnight.
Place juice and water in 6- or 8-qt. saucepot. Stir pectin into juice mixture in saucepot. Add butter to reduce foaming. Bring mixture to full rolling boil (a boil that doesn't stop bubbling when stirred) on high heat, stirring constantly.
Stir in sugar. Return to full rolling boil and boil exactly 1 min., stirring constantly. Remove from heat. Skim off any foam with metal spoon.
Ladle immediately into prepared jars, filling to within 1/4 inch of tops. Wipe jar rims and threads. Cover with two-piece lids. Screw bands tightly. Place jars on elevated rack in canner. Lower rack into canner. (Water must cover jars by 1 to 2 inches. Add boiling water, if necessary.) Cover; bring water to gentle boil. Process 5 min. Remove jars and place upright on a towel to cool completely. After jars cool, check seals by pressing middles of lids with finger. (If lids spring back, lids are not sealed and refrigeration is necessary.)
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