Rinse the berries and place into a very large stock pot over medium heat
Prepare your jars, make sure you are using new lids so that they seal properly. Place the lids in a small sauce pan covered in water. Put over high heat and boil for 5 minutes to sanitize.
Wash the rest of the jar in soapy hot water and place on a large towel to dry.
Add the sugar and stir until the sugar melts and the berries release juice
Add the pectin & lemon juice
Turn the heat up to medium high. Once boiling take a long potato masher and squish the berries up while you stir.
Allow the mixture to get to a roaring boil for 5 minutes. Turn the heat off.
Work in batches, fill a blender up but be sure to not overfill, place the top of the blender on and use a kitchen towel to hold the top in place so that you do not burn your hand. Pulse a couple times.
Pour the hot jam into the clean bottles. Repeat until all the jam is in jars. Be sure to not overfill the jars, you should leave the last 1/4 inch unfilled so the jam can expand while you process in a steam bath.
Clean the top of the jars with a wet cloth, making sure nothing is there so that the lid can seal to the jar.
Place the lids on and screw them up tight.
Place the jars in a steam bath or water bath. Once the water is boiling and steam is coming out, set a timer for 20 minutes.
After 20 minutes remove the jam jars, place them on the same large towel and allow to cool completely. This takes a couple hours. As the jars cool the top button on the jar should seal tight, sucked in.
If the button is sucked in, your jam is preserved and can sit on the shelf for up to 1 year.