If you want to give more body to your macaroni sauce, you could add a teaspoon of cream to the butter and melt in a saucepan before transferring the mixture to the bowl with the anchovies and capers. And again, if you like the pairing of butter and anchovies, you could use it as a topping for bruschetta which you might serve as a finger-food hors d’oeuvre at a dinner party with friends.