Rhubarb Pie
["4 c. cubed, unpeeled rhubarb", "1 to 1 1/2 c. sugar", "3 beaten egg yolks", "1/4 c. quick cooking tapioca", "1 Tbsp. butter", "3 egg whites", "6 Tbsp. sugar"]
["Combine rhubarb, sugar, egg yolks and tapioca in top of double boiler. Cook over boiling water until tapioca is dissolved and rhubarb is tender.", "Stir in butter.", "Pour in baked pie shell. Beat until foamy the egg whites. Add sugar gradually. Beat to soft peak stage.", "Put over pie and bake until meringue is brown."]
["unpeeled rhubarb", "sugar", "egg yolks", "tapioca", "butter", "egg whites", "sugar"]