Blackberry Jam - cooking recipe

Ingredients

9 -10 pints blackberries (should make 9 cups crushed)
6 cups sugar

Preparation

Clean, de-stem and crush blackberries.
In a large stainless steal or enamel pot combine crushed berries and sugar.
bring to a boil, stirring often until sugar is dissolved.
Cook to jell point, stirring often.
Remove from heat, skim off foam and ladle into clean hot jars.
Leave 1/4 inch head space.
Process in a boiling water bath for 10 minutes at altitudes up to 1000 feet.