I always prefer to mix my own cocktail sauce, that way I can control how much kick it has!

1/2 cup ketchup
2 tablespoons horseradish
1 tablespoon fresh squeezed lemon juice
2 drops of Worcestershire sauce
Tabasco sauce, to taste

Mix all the ingredients together and put into the refrigerator for about 20-30 minutes.  Let stand at room temperature for about 30 minutes before using.