Directions

1. Add pureed blueberries to cooker. Set to "slow cooker" and adjust for 1 hr. Cover with glass lid and cook.
2. After 1 hr, stir the blueberries.
3. Place the glass lid back on but leave it slightly ajar to allow steam to escape.
4. Set to "slow cook" and adjust for 8 hrs. Check on cooking progress throughout in case less time is needed.
5. With 1 hr left to cook, add sugar, cinnamon, nutmeg, lemon juice, and lemon zest. Cook until thick, spreadable consistency is achieved.
6. For a smoother butter, puree in a food processor until smooth or until desired consistency is reached.
7. Ladle blueberry butter into canning jars, if canning, and follow all instructions.