Sesame Flank Steak

In a 8 to 10-inch heavy frying pan, stir sesame seed over low heat until golden, 2 to 3 minutes.

Crush in a mortar and pestle or food processor.

In a bowl, mix onion, soy sauce, oil, vinegar, brown sugar, ginger, garlic, mustard, Worcestershire and sesame seed.

Place steak in a 9 x 13-inch dish and pour sesame mixture over top.

Cover and chill, turning occasionally, at least 4 hours or overnight.

Cook steak over hot coals, turning once to your liking, 5 to 6 minutes a side for medium-rare.

Cut across the grain in thin slices to serve.

Serves 4.