The two may look alike, but the taste is far from the same. Tangy Russian dressing is typically made with a ketchup-mayonnaise base, pickle relish, horseradish, Worcestershire sauce, and spices. It’s spicier and less sweet than Thousand Island, which is made with mayonnaise- ketchup, pickle relish, onion flakes, garlic powder, paprika, and salt and pepper.