This salmon gravlax recipe is a nod to shrimp cocktail, and can easily be made ahead of time. Coat the fish with a mix of salt and sugar flavoured with lemon and pink peppercorns, which provide it with just the right amount of personality. Serve it with a cocktail sauce-inspired dressing, featuring horseradish and ketchup to make it both sweet and slightly spicy. It's a fancy yet casual option, best served with plain potato chips.