Better Cocktail Sauce

Directions

1. 1
   Combine the ketchup, vinegar, and butter in a small saucepan and cook over medium-low heat, stirring occasionally, until the butter melts.
2. 2
   (At this point, you can keep the sauce warm for an hourbut make the heat as low as possible.)
3. 3
   Add horseradish to taste.