Reuben Sandwiches are usually slathered with Russian dressing, but I use homemade Thousand Island dressing instead. You might be wondering what the difference is. Let me explain the difference: Both dressings contain mayo and ketchup, but there are a few differences. Russian dressing is usually a bit spicier due to the horseradish (which I hate and Scott loves). Russian dressing also has Worcestershire sauce in it. Thousand Island dressing, on the other hand, has sweet relish, which I love. However, I also LOVE spicy food. I found an easy fix, I add both sweet relish and pickled jalapeno peppers so I get the spicy flavor without the dreaded horseradish taste. Both sauces can also include vinegar/lemon juice, salt, pepper, garlic, and onion powder. Although Russian dressing is a key ingredient in a Reuben sandwich, my sauce is more similar to Thousand Island dressing. If you prefer the taste of Russian dressing, you may want to mix in some horseradish and Worcestershire sauce. Start with a 1/2 tsp. of each, taste and add more if needed.