After cleaning your berries either mash them with a potato masher or run them through a food processor
Run the berries and juice through a sieve saving the juice . Setting the pulp and juice aside
Add the juice to a saucepan . This is optional but I add 1/2 cup of pulp and seeds to the juice .
Turn the heat on high and add the sugar and lemon juice .
Stirring until all of the sugar is dissolved .
Bring the mixture up to a rolling boil that can't be stirred down . Boil for 4-5 minutes stirring continuously
Add the packet of pectin . Bring back to a boil and cook for another minute
Add a tablespoon of butter to reduce the foam or skim it off the top
Pour hot jam into sterilized canning jars
Wipe the rims with vinegar . Place the sterilized lids on top of the jar and then place the rings on finger tight
Submerge the jars into boiling water , covering at least 2 inches over the top . Set the timer for 10 minutes
Carefully remove the jars
Place the jars in the upright position and do not disturb for about 24 hours . You will hear the jars ping as they seal . Sealed jars are shelf stable for 1 year in a dark pantry
Notes
If you like your jam firm you can add a second pouch of pectin