Saskatoon Pie Filling

4 cups water
1/2 cup lemon juice
12 cups fresh saskatoon berries
3 cups sugar
1 cup cornstarch

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Boil together the water and lemon juice.
Add the saskatoons, and bring to a boil again.
Mix the sugar with the cornstarch thoroughly.
Add the sugar/cornstarch mixture to the saskatoons.
Stir and cook until juice is thickened and clear.
Pour in sterilized quart or pint jars.
Seal.
Process in hot water bath for 20 minutes for quarts or 15 minutes for pints.