OLD FASHION LEMON MERINGUE PIE

This recipe was found in my late mother's shoe box recipe collection. It was cut from an old box. I would imagine it was a cornstarch box.

1 cup sugar
3 tbsp cornstarch
1 1/2 cups cold water
3 egg yolks, slightly beaten
Grated rind of 1 lemon
1/4 cup lemon juice
1 tbsp margarine
1 baked 9-inch pastry shell
3 egg whites
1/3 cup sugar

In a 2-qt saucepan stir together the 1 cup sugar and cornstarch. Gradually stir in water until smooth. Stir in egg yolks. Stirring constantly, bring mixture to a boil over medium heat; boil one minute. Remove pan from the heat. Stir lemon rind, lemon juice and margarine into the mixture. Cool slightly. Pour mixture into the prepared pastry shell. In a small mixer bowl, with mixer at high speed, beat egg whites until foamy. Gradually beat in the 1/3 cup of sugar; beat until stiff peaks form. Spread meringue over filling starting with the edge and sealing meringue to crust. Continue filling in the center until all meringue is piled on the filling. Bake in a 350 degree oven for 15 to 20 minutes or until lightly browned. Cool before slicing.