At the tail end of quince season, this butter is a great way to use quince too ripe for jam. Use a food processor if mashing fruit through a food mill isn't an option -- and throw in extra rosemary for a headier, more savory flavor.
They don't call it paradise for nothing! Quinces, crabapples and lingonberries combine forces to make the prettiest, most delicious jelly you've had. This is your grandma's jelly. She knew what was good.
I use the slow cooker, following Marisa’s apple butter method. Since I tend to take a light hand with spicing and sugar, I really end up producing something between a pear sauce and pear butter. I used four large bosc pears plus one quince.