Strawberry Pie

My husband's favourite summer dessert, made from fresh strawberries.

4 cups fresh strawberries
1 cup sugar (I have good results only using 1/2 cup sugar if you want to cut down on the sweetness)
3 T cornstarch
2 T lemon juice
1 tsp butter

Crush 2 cups of berries in a small saucepan. Stir in sugar, cornstarch and lemon juice. Bring to a boil, stirring, until thickened and filling turns from a cloudy red colour to clear, about 10 minutes. Remove from heat and stir in the butter. Cool completely, fold in the rest of the strawberries and pour into a baked pie crust. Chill.