If there was ever an essential condiment for fresh, simple seafood, it would be cocktail sauce. This deft mixture of ketchup, chili sauce, horseradish and lemon juice is the classic accompaniment to fresh or fried shrimp, but is delicious on everything you'd find on the shellfish tower. Tailor the horseradish and hot sauce to your heat level, and switch up the flavors by using sriracha or a Mexican hot sauce like Cholula instead of the traditional Tabasco.