Blackberry Jelly - cooking recipe

Ingredients

3 qt. firm ripe blackberries
3 1/2 c. berry juice
1/4 c. plus 1 tsp. lemon juice
4 1/2 c. sugar
1 pkg. pectin

Preparation

Wash berries and crush. Heat to a boil and squeeze out juice. To 3 1/2 cups of juice, add lemon juice.
Measure 4 1/2 cups sugar into a dry dish.
Pour juice into a large kettle.
Add pectin and stir well.
Bring to a boil.
Add measured sugar and mix well. Continue stirring and bring to a full rolling boil.
Pour into prepared jars and seal.