2 1/2 pounds Northern Spy apples
1 cup packed dark-brown sugar
1/2 teaspoon coarse salt
Peel, quarter, and core pears and apples. In a food processor, finely grate fruit (in batches if necessary), then transfer to a 5- to 6-quart slow cooker. Stir in dark-brown sugar, salt, and cinnamon stick. Cover and cook on high, 4 hours. Mash with a potato masher. Laddle into jars.
Refrigerate, up to 3 weeks, or freeze, up to 3 months.