Mix 1/4 cup of sugar from measured amount with Sure-Jell. (Make sure to use the pink box of less or no sugar needed pectin!).
07Stir sugar & pectin mixture into berries. Add 1/2 teaspoons butter to reduce foaming, if desired.
08Bring to a full rolling boil (a boil that does not stop bubbling when stirred) stirring constantly.
09Stir in sugar, quickly. Return mixture to a full rolling boil and boil exactly 1 minute, stirring constantly.
10Remove from heat. Skim foam from top with metal spoon.
11Ladle quickly into jars to within 1/8 inch of top.
12Wipe jars' rims and threads and top with two-piece lids.
13Place jars in water bath canner for 10 minutes, then remove from canner. Let cool completely before storing. Press on middle of the lid to make sure lids have sealed. If not, store in refrigerator.