Plum Jam
without added pectin

1 oz chopped tart plums (about 4 pounds) 
3/4 cups sugar 
3 tbsp water 
dash lemon juice 

Yield: About 1 half-pint jars 

Combine all ingredients; bring slowly to boiling, stirring occasionally until sugar dissolves. Cook rapidly to, or almost to, the jellying point 

cooks in about 5 min