Good Chocolate Pie
["1 c. sugar", "1/4 c. flour", "3 Tbsp. cocoa", "1/4 tsp. salt", "1 c. milk", "1 c. evaporated milk", "3 egg yolks, slightly beaten", "1/2 stick butter", "1 tsp. vanilla", "1 baked pie shell", "3 egg whites", "pinch of salt", "1/4 tsp. cream of tartar"]
["Mix first 4 ingredients well.", "Add both milks.", "Cool, slowly stirring often and well until thickens.", "Add slightly beaten egg yolks.", "Cook about 1 minute.", "Add butter and vanilla.", "Cook about 2 to 3 minutes more, until smooth and thick.", "Cool well.", "Add to baked pie shell."]
["sugar", "flour", "cocoa", "salt", "milk", "milk", "egg yolks", "butter", "vanilla", "shell", "egg whites", "salt", "cream of tartar"]