Concord Grape Jelly with Green Apples

If you’re not sure your concord grapes are pectin-rich—that is, if they’re all fully ripe—try this recipe. Here the lemon and the peels and cores of green apples provide an extra shot of pectin and tartness. The grape flavor is not quite as intense as it is in jelly made with partly unripe grapes, but it will certainly satisfy any grape-jelly craving you might have.