prepared horseradish (not creamed horseradish)prepared horseradish is finely grated and pickled, and can be found in the refrigerated section--often in the the seafood case
Worcestershire sauce
lemon juice
Instructions
All ingredients are to taste. I start with about to 2 tablespoons horseradish to ¾ cup of ketchup, and add about a teaspoon each of Worcestershire and lemon juice. After that, I taste and adjust until I'm happy.