Blueberry butter is like apple butter only made with blueberries rather than apples. It's an intense flavor, but I really
blueberries. I cook them down just a bit with just a little liquid, run them through a sieve or a food mill to lose the skins, and then add a little sweetness (sugar or honey, your choice) and cinnamon for spice. Finally, I cook it low and slow until it will mound on a spoon and can it up.