Crock Pot Fruit Butter
Adapted from a recipe on Simple Bites
2 cups blueberries, cleaned and checked over for stems
4 cups plums, washed, pitted, chopped
2 1/2 cups sugar
zest and juice of one lemon
1 teaspoon cinnamon
1/2 teaspoon fresh grated nutmeg
You can puree the fruit before hand in a blender or food processor, or do it later with a stick blender (this is what I did).
Put all the ingredients in the crock pot and cook on high. Leave the lid propped open to let steam escape and butter to thicken. Cook 4-5 hrs on low, 6-8 on high. Stir occasionally. Once butter is to desired thickness, ladle into hot jars with 1/2 headspace and process 10 min. Makes 4 pints.
You may want to reduce sugar if your plums aren't as tart as mine.