
Boil one cup of blueberries with water, sugar, and salt. Mix the cornstarch with water. Add it to the mixture while stirring, then let it boil for a few minutes until it thickens. Then remove from heating.
Add 3 cups of blueberries to the warm mixture. Cool down and pour onto the cooked pie crust.

The best way to freeze blueberries is to dry them well after washing, spread them out on parchment paper for 1 hour in the freezer, then place them in an airtight container or bag, removing as much air as possible from the inside.
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