Instructions: Preheat oven to 350. In heavy saucepan, combine 1 1/3 cups sugar and cornstarch; add Realemon. In small bowl, beat egg yolks; add to Realemon mixture. Gradually add water, stiring constantly. Over medium heat, cook and stir until mixture boils and thickens, about 8 to 10 minutes. Remove from heat. Add margarine, stir until melted. Pour into prepared pastry shell. In small mixer bowl, beat egg whites with cream of tartar until soft peaks form; gradually add remaining 1/3 cup sugar, beating until stiff but not dry. Spread on top of pie, sealing carefully to edge of shell. Bake 12 to 15 minutes or till golden brown. Cool.

Chill before serving. Refrigerate leftovers.

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