Makes 4 cups

4 cups fresh or frozen wild blueberries
4 cups sugar
1 pouch liquid fruit pectin
1 teaspoon finely grated lemon rind
2 tablespoons lemon juice

Pour half of the blueberries into large Dutch oven; gently mash to just break up. Stir in sugar and remaining blueberries. Heat over low heat, stirring often, until sugar dissolves. Increase heat to high and bring to full rolling boil and boil for 1 minute. Stir in fruit pectin, lemon rind and juice; return to boil.
Pour into hot sterilized 1-cup jars, leaving ½-inch headspace. Cover with prepared lids; screw on bands fingertip tight. Boil in boiling water bath canner for 10 minutes, timing from when water returns to boil. Let cool on rack. Check seals.
(refrigerate any jars with lids that have not snapped downward to use within 3 weeks). Wipe jars; store in cool dark, dry place for up to 1 year.