Chocolate Pie
["3 egg yolks", "2 Tbsp. chocolate", "1 c. sugar", "1 Tbsp. cornstarch or 3 Tbsp. flour", "1 c. boiling water", "1 tsp. vanilla", "1 Tbsp. butter"]
["Mix cornstarch, sugar and chocolate.", "Add boiling water.", "Add egg yolks and cook until thick.", "Add vanilla and butter; beat well.", "Cool.", "Pour in baked pie shell.", "Add meringue and brown in oven."]
["egg yolks", "chocolate", "sugar", "cornstarch", "boiling water", "vanilla", "butter"]