Place a canning rack or rubber trivets in the bottom of the canning pot. Fill the canning pot full of water (with jam jars inside) and bring to a boil.
Place the lids and rings into a pot and cover with water. Bring the pot to a boil and then turn down to a gentle simmer.
While the pots of water heat up, clean and hull the strawberries, slice thickly and put into the food processor.
Crush the strawberries into a thick pulp. Once there is 12 cups worth, put into a large sauce pot.
Add the juice and pectin and whisk to combine.
Bring to a boil, stirring with the wooden spoon.
Boil for 3 minutes, continuing to gently stir with the wooden spoon.
Remove from heat. Using the jar lifter, pull a jar out of the boiling water.
Using the funnel, ladle the jam into the jar until 1/4 inch from the top. Wipe any drips off with the paper towel.
Use a small pair of tongs to lift a lid and ring out of their pot and place on the jar. Screw tightly and set aside.
Once all the jars have been removed from the water, use the jar lifter to place the filled jars back in and bathe for 10 minutes.
Once done in the water bath, removing using the jar lifter and set aside to cool.