Blackberry Jelly - cooking recipe

Ingredients

5 quarts blackberries
1 1/4 cups water
white sugar

Preparation

Combine berries and water.
Bring slowly to a boil.
Cook until berries are soft.
Strain overnight in a jelly strainer, lined with cheesecloth that has been wrung out in hot water.
Measure juice.
Boil juice 8-12 minutes.
Skim.
Remove from heat.
Add sugar: 3/4 cup sugar per 1 cup of juice.
Stir until dissolved.
Return to heat and boil until 220F.
on a thermometer.
This should take 3-10 minutes.
Pour into sterilized jars and seal.