I bought small jars because I didn't want to make a huge batch not knowing what the outcome would be. Plus, these jars are super cute.
This is the recipe I used.
10 cups of frozen blueberries
1 cup of organic pear juice
1 cup of sugar
1 -1.75 ounces package of pectin
I put the blueberries and the juice in the blender because mashing just wasn't working out for me. Then, I cooked the blueberry mush and sugar and pectin until it was boiling hard.
Meanwhile, I had the empty jars in simmering to sterilize them and for whatever reason the jars should be hot when you fill them. (In the black pot.) My stove got a workout but I did this after 9pm so our electricity was cheaper. 
I filled the jars but left to much head room apparently.
Then, I boiled the jars for 10 minutes. (in the big red pot)Ta-DA! It tastes amazing too!
This took me exactly an hour from start to finish and I am very happy with the way it turned out. Now I know to fill the jars more next time, get a canning tong because, well, lets just say bbq tools aren't the best for this job, and I will add a little more pectin as the jam is not a thick as I think it should be.
If you try this beware that your spoon will never be the same. This is clean.
