Instructions: 1. Combine ingredients for the rub in a bowl, and mix. Sprinkle 3 to 4 tablespoons all over the beef, patting it in. Place in a baking dish, and cover with plastic wrap. You can cover the beef with the rub for a few hours, but for maximum flavor, leave it for 3 days in the refrigerator, turning once a day.

2. Prepare a hot grill. Grill beef 30 to 40 minutes, or until outside is crusty and dark brown and internal temperature is about 120 degrees (for rare). Turn beef often. Transfer to a cutting board; let it rest 5 minutes.

3. Slice beef thinly across grain. Pile beef high on a roll or bread slathered with horseradish sauce. Garnish with onions, tomatoes and sliced lettuce. Serve.

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