The classic Thousand Island dressing blends creamy, tangy, and slightly sweet flavors. Start by combining ½ cup mayonnaise with 2 tablespoons ketchup and 2 tablespoons sweet pickle relish. Finely mince a small hard-boiled egg, a few green olives, and a teaspoon of onion, and fold them into the mixture. Add 1 teaspoon white vinegar or lemon juice, a pinch of sugar, salt, and freshly ground black pepper. Mix until smooth and refrigerate at least an hour to let flavors meld. Serve over salads, as a sandwich spread, or with seafood for a versatile, iconic dressing.