Combine Hellmann's® or Best Foods® Light Mayonnaise, horseradish and Worcestershire sauce in small bowl.
Evenly spread mayonnaise mixture on each bread slice. Top with tomato, onion, roast beef and cheese. Broil 1 minute or until cheese is melted. Garnish, if desired, with chopped fresh chives or green onions.
Also terrific with Hellmann's® or Best Foods® Low Fat Mayonnaise Dressing or Hellmann’s® or Best Foods® Canola Cholesterol Free Mayonnaise.