• prep: 20 min
• cook: 0 hr
• total: 20 min

servings:

Quick touches are the key to good steak sandwiches: In 15 minutes, the beef absorbs the flavors of the marinade, and sliced onions become a sweet-tart component.

• 1 top round steak (1 pound), about 1 1/2 inches thick
• 1 tablespoon Worcestershire sauce
• Coarse salt and ground pepper
• 1 medium red onion, halved and thinly sliced
• 6 tablespoons white-wine vinegar
• 1 teaspoon sugar
• 2 tablespoons olive oil
• 1 head (10 ounces) red-leaf lettuce, torn into bite-size pieces
• 8 slices whole-wheat bread, toasted
• 2 tablespoons Dijon mustard

Click Here For Step-By-Step Instructions