Kids from miles around appear at Hildur’s house on Halloween, looking for this treat that they’ve come to expect.
Melt butter in a heavy saucepan. Add sugar, milk, and chocolate, and stir constantly until chocolate is melted. Boil for 13 minutes on medium-low heat, stirring occasionally. Remove from heat and add vanilla (and walnuts or peanut butter) and beat until creamy. Work quickly. Pour at once into a buttered pan, cool slightly, and mark into squares.