plums, pitted and diced
- Combine all ingredients in a large saucepot.
- Bring to a boil, stirring until sugar dissolves.
- Cook rapidly almost to gelling point.
- As mixture thickens, stir frequently to prevent sticking.
- Ladle into hot jars, leaving 1/4 inch head space.
- Adjust two-piece lid caps.
- Process 15 minutes in a boiling water canner.