1 (9 inch) pie shell, baked
1 c. sugar
1/2 c. cornstarch
1/4 tsp. salt
1 1/2 c. hot water
4 egg yolks, beaten
2 tbsp. butter
1 (6 oz.) frozen lemonade concentrate

Combine sugar, cornstarch, and salt in a saucepan; slowly stir in water. Add remaining ingredients. Cook, stirring constantly over low heat to a full boil. Cool to lukewarm. Pour into pie shell, top with meringue. Bake in preheated oven at 325 degrees 20 to 25 minutes until lightly brown.

MERINGUE:

4 egg whites
1/4 tsp. cream of tartar
1/2 c. sugar

In a deep bowl, beat the egg whites with the cream of tartar until frothy. Gradually beat in the sugar a little at a time and continue beating until stiff and glossy.