Mixed Berry Jam - cooking recipe

Ingredients

2 cups blueberries
2 cups raspberries
2 cups strawberries
2 cups blackberries
3 cups sugar
1 lemon, juice of
2 teaspoons lemon rind, grated

Preparation

In a large pan, combine berries with sugar.
Crush berries with a potato masher.
Add lemon juice and lemon rind.
Bring to a boil, skimming off any foam that forms.
Cook at a full boil until jam thickens, approximately 30 minutes (jelling point is 221F).
While the berries are cooking, sterilize your jars and heat the seals in a pan of hot water.
Pour jam into hot jars; wipe rims, place seals and screw on bands fingertip-tight.
Process in a boiling water bath for five minutes; remove to a protected countertop and let cool, undisturbed for 24 hours.
If any of the lids have not sealed, either re-process or store in the refrigerator and use those jars first.