So, yesterday I took 4 dry pints of blueberries and mixed them with about 3/4 c of sugar. I let them sit for a couple of hours and then put them on the stove under gentle heat. I watched them very closely. I wanted the sugar to melt but not get them hot enough for the berries to pop. Once they were off the heat, I added a generous "glug" of Grand Marnier. They are very tasty. I ended up with 3 pints canned.