Peanut Butter Fudge
["1/2 cup milk", "2 cups sugar", "1/4 tsp cream of tartar", "1 tsp vanilla", "1/2 cup peanut butter", "1 tbsp butter"]
["Mix first four ingredients in a heavy skillet and cook until it reaches soft ball stage; then add peanut butter and butter. Remove from heat and beat by hand until it starts to thicken. Pour onto a buttered platter.", "Chill and cut."]
["milk", "sugar", "cream of tartar", "vanilla", "peanut butter", "butter"]