Old Fashioned Blackberry Jam - cooking recipe

Ingredients

1 gal. blackberries
equal amount of sugar

Preparation

Measure blackberries that have been cleaned and washed.
Crush well and add an equal amount of sugar in a large kettle.
Mix well.
Bring to a quick boil and cook rapidly, stirring often. Cook until large bubbles appear.
Ladle into jars and seal.