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Instructions:
- Prepare a boiling water bath canner and sterilize 7 half-pint jars. Keep the jars hot until ready to fill.
- Wash and remove the stems from the Concord grapes. Place the grapes and water into a large saucepan.
- Bring the mixture to a boil over medium-high heat, crushing the grapes occasionally with a potato masher. Reduce the heat slightly and simmer for about 10 minutes, or until the grapes are very soft.
- Pour the cooked grapes into a damp jelly bag or several layers of cheesecloth set over a large bowl. Allow the juice to drip naturally without squeezing to produce the clearest jelly.
- Measure exactly 5 cups of the strained grape juice into a large saucepan.
- Whisk the powdered fruit pectin into the grape juice. Bring the mixture to a full rolling boil over high heat, stirring constantly.
- Add the granulated sugar all at once and return the mixture to a full rolling boil. Boil hard for exactly 1 minute while stirring continuously.
- Remove the saucepan from the heat and skim off any foam if desired for a clearer finish.
- Ladle the hot jelly into the prepared hot jars, leaving ¼-inch headspace.
- Remove any trapped air bubbles if necessary, wipe the jar rims clean, and apply the lids and screw bands until fingertip tight.
- Process the jars in a boiling water bath:
- Half-pint jars: 10 minutes
- Pint jars: 10 minutes
- Adjust processing times according to your altitude if necessary.
- Carefully remove the jars and allow them to cool undisturbed for 12 to 24 hours. Check that each lid has sealed properly before storing in a cool, dark place.
Variations
- Add a tablespoon of fresh lemon juice for a brighter, slightly tangy flavor.
- Mix Concord grapes with a small amount of blackberries for a richer berry taste.
- Infuse the grape juice with a cinnamon stick during cooking, then remove it before adding the pectin.
- Substitute part of the Concord grapes with red grapes for a milder flavor profile.
- Use the finished jelly as a glaze for roasted pork, chicken, or baked ham.
Tips
- Choose fully ripe Concord grapes for the richest flavor and deepest color.
- Do not squeeze the jelly bag while straining, as this can result in cloudy jelly.
- Measure both the juice and sugar accurately to ensure a proper set.
- Stir constantly once the pectin and sugar are added to prevent scorching.
- Skim the foam before filling the jars for a smoother, more attractive finish.
- Allow the jars to cool undisturbed for at least 24 hours so the jelly has time to set completely.
- Once opened, refrigerate the jelly and enjoy it within several weeks for the best quality.