In a large resealable bag, combine soy sauce and worcestershire sauce. Add the beef; seal bag and turn to coat. Refrigerate for 2 hours, turning occasionally.
Drain and discard marinade. Rub the beef with garlic and pepper; place in a shallow roasting pan. Add broth to the pan. bake, uncovered, at 425 degrees for 45-55 minutes or until meat reaches desired doneness (for medium-rare, a meat thermometer should read 145 degrees; medium, 160 degrees; well done, 170 degrees). Let stand for 10 minutes before slicing.
Meanwhile, in a small saucepan, melt butter. Add mushrooms and garlic; sauté until tender. Add the cheese, worcestershire sauce and Caraway seeds; cook and stir over low heat until cheese is melted. Stir in onions; heat through. Serve sauce with beef.
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