Crush berries in a large kettle. Stir in pectin; bring to a full rolling boil over high heat, stirring constantly. Stir in sugar; return to a full rolling boil. Boil for 1 minute, stirring constantly. Remove from the heat; skim off any foam. Pour hot into hot jars, leaving 1/4-in. Headspace. Adjust caps. Process for 10 minutes in a boiling-water bath. Yield: about 7 half-pints.
