Blueberry Pie

1 cup blueberries
1 cup water
1 cup white sugar
3 tbsp cornstarch
1 tbsp butter
3 cups chilled, raw blueberries

Boil 1 cup of blueberries, water, and sugar in saucepan. Thicken with cornstarch. Remove from heat and add butter. Let butter melt. Add raw berries and pour into a baked pie shell. Serve with whipped cream.