lemon meringue pie

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Store bought pie crust
Filling:
1.5 cups sugar
1 1/4 cup water
6 tbsp cornstarch
1/2 cup lemon juice
3 large yolks
2 tbsp milk
Zest of a large lemon
Meringue
3 large egg whites
8 tbsp sugar
1/8 tsp cream of tartar