Lemon Pie
["1/2 c. plain flour (rounded)", "1 1/4 c. sugar", "1 1/3 c. boiling water", "3 egg yolks, beaten with 1 white", "1/2 Tbsp. butter", "juice and grated rind of 1 lemon"]
["Combine flour and sugar in double boiler. Add boiling water, stirring constantly. Add egg yolks, stirring vigorously. Cook until mixture drops in thick sheets. Add butter, lemon juice and rind. Cool.", "Pour in baked shell.", "Top with meringue."]
["flour", "sugar", "boiling water", "egg yolks", "butter", "lemon"]