Grilled Beef Tenderloin Sandwiches

Directions

• Combine the first 4 ingredients; rub over meat. Refrigerate for 2 hours. Remove papery outer skin from garlic (do not peel or separate cloves). Cut top off of garlic. Brush with oil.
• Wrap bulb in heavy-duty foil. Bake at 425° for 30-35 minutes or until softened. Cool for 10-15 minutes. Squeeze garlic into food processor; add mayonnaise and yogurt. Process until smooth; chill.
• In a large nonstick skillet, heat olive oil and saute onion for 5 minutes. Reduce heat; cook and stir for 10-12 minutes or until onion is golden. Add mushrooms; cook and stir until tender. Add next 4 ingredients; cook until reduced slightly
• Lightly oil the grill rack. Grill beef, covered, over medium heat or broil 4 in. from the heat for 5-6 minutes on each side or until meat reaches desired doneness (for medium-rare, a thermometer should read 135°; medium, 140°; medium-well, 145°). Let stand for 10 minutes before cutting into 4 slices.
• Serve warm on bread with garlic mayonnaise, arugula and onion mixture.