Kalamansi Pie

Assemble these supplies:

1 1/4 cups sugar
1/3 cup cornstarch
1/2 teaspoon salt
1 1/2 cups boiling water
3 eggs, separated
1/3 cup kalamansi juice

Steps in preparation:

Combine 1 cup of the sugar, cornstarch and salt in a double boiler. Add boiling water, stirring constantly. Cook over boiling water until smooth and thickened, stirring constantly. Cover and cook 15 minutes. Beat egg yolks with 1/4 cup sugar, and gradually pour hot mixture over them, while stirring. Return to double boiler and cook 5 minutes longer. Just before removing from heat add kalamansi juice. Mix well; cool. Pour into baked pie shell. Top with meringue made from 3 egg whites. Brown lightly in 350°F, oven.