Remove the lids from the jars. Wash the lids in soapy water, rinse and place in a medium sauce pan covered with water. Put on low heat to simmer. Wash the screw lids, rinse and set aside.
Place the jars in your dishwasher and set to sterilize. This usually takes 2-3 hours so plan ahead.
Wash the berries and drain.
Fill your canner with water to within 3 inches of the top. Attach the jar rack, put the lid of and set on high so you get a roiling boil.
Remove the tops of the berries with a paring knife and any other spoiled spots.
You can chop the berries or use your food processor. I find that about 20 berries in the food processor works best. Just pulse a few times and place the chopped berries in a large bowl.
Measure out the sugar and pectin in separate bowls. I add a small amount of sugar to the pectin and mix it in to prevent clumping.
Measure out a 1/4 cup of lemon juice.
Place a small plate in the freezer to test for jam consistency.