½ cup water (using apple, grape or orange juice to replace water is optional)
4 ½ to 5 cups sugar
Method
Wash, slice and de-pit the plums
Heat the plums and water or juice in a pot over medium heat until plums are soft
Measure the puree (you should have about 6 cups)
Combine the puree and sugar in a pot and simmer over medium heat, stirring frequently until very thick, about 1 to 1 ½ hours
Keep the jars warm
Remove the puree from the heat and ladle into hot
Wipe the tops and threads of jars with a damp cloth. Put on the lids
Process in a boiling *water bath for 10 minutes
*Water bathing
A large saucepan, Dutch oven or other kettle works great. If you have a cake or other rack that will fit in the bottom, and if the pan is deep enough to hold water to cover the jars on the rack and still has room to boil. Depending on the height of the rack, this would require a pan 172 cm deep. Put the rack in the bottom of the pan, pour in enough water to almost half full and heat to boiling. At the same time heat more water in a tea kettle or other pan. gently lower the filled and sealed jars onto the rack, then pour boiling water, enough to cover. Heat to boiling, then cover and begin timing as the recipe directs.
