Blackberry Jam - cooking recipe

Ingredients

2 1/2 lb. blackberries
1 1/2 lb. sugar

Preparation

Wash berries thoroughly; remove caps and crush berries.
Heat slowly to boiling, stirring constantly.
Add sugar and continue cooking rapidly until mixture gives test for jelly.
Test by drawing the spoon across the center of the pan.
If the mark does not fill in quickly, the jam
is thick enough.
Pour into sterile jars and seal.
If seedless jam is desired, rub cooked berries through sieve before adding sugar.
Makes 2 pints.