Butterscotch Topping
["2 egg yolks", "2/3 c. half and half", "1 c. brown sugar", "2 Tbsp. butter"]
["Mix together egg yolks and half and half.", "Add brown sugar and bring to a boil.", "Remove from heat and add butter until melted. Stir constantly."]
["egg yolks", "brown sugar", "butter"]