Combine Worcestershire sauce and vinegar in a medium bowl. Add roast beef, and toss to combine.
. Combine mayonnaise, chopped sun-dried tomato, and blue cheese in a small bowl; stir well. Spread about 1 1/2 tablespoons mayonnaise mixture on each of 4 bread slices. Top evenly with roast beef, lettuce, tomato, and remaining bread slices.
Great sandwich recipe - the Worcestershire/balsamic mixture goes really well with the blue cheese and sun-dried tomatoes. I definitely used more than 1 tsp of blue cheese per sandwich (1 tsp? really?).
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