1Heat oven to 425°F. Line cookie sheet with waxed paper. Sprinkle beef with salt and pepper. In 12-inch skillet, heat 2 tablespoons of the oil over medium-high heat. Cook beef in oil 10 minutes, turning once, until browned. Cool 5 minutes.
2On large sheet of waxed paper, arrange pancetta slices in 2 rows, overlapping to form rectangle the same length and width as tenderloin. Place beef on edge of one long side of pancetta. Sprinkle beef with garlic and rosemary. Roll up tightly, using waxed paper as a guide. Discard waxed paper. Tie beef with heavy kitchen string, securing at 1-inch intervals. Place on cookie sheet. Brush with remaining 1 tablespoon oil.
3Bake 30 minutes or until pancetta is crispy and beef is of desired doneness. Let stand 10 minutes. Remove string before slicing.