Preparation
Heat a large cast-iron skillet over medium-high heat. Secure onions with toothpicks so they stay intact when flipped. Dress onions with EVOO, salt and pepper and add to hot pan; caramelize onions for 3 - 4 minutes on each side.
While onions cook, place meat in a bowl and mix with Worcestershire, mustard, salt, pepper and grated onion – grate onion directly over the meat so that it catches all the juice.

