Blackberry Jelly
["3 qt. ripe blackberries", "7 1/2 cups sugar", "1 6 oz. bottle of liquid fruit pectin"]
["Sort and wash the berries, remove stems and caps.", "Crush berries to extract 4 cups of juice, combine juice with sugar in a large saucepan and mix well.", "Place over high heat and cook, stirring constantly until it comes to a rapid boil.", "Boil hard for one minute, again stirring constantly.", "Add pectin and bring to a full rolling boil.", "Boil one more minute stirring constantly. Remove from heat, skim off the foam with a metal spoon.", "Pour jelly quickly into sterilized glasses.", "Seal and cool.", "Yield about 8 to 9- 1/2 pints."]
["ripe blackberries", "sugar"]