Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2                    red onion -- peeled and very
                        thinly sliced
     1/4  cup           lime juice
     1/4  teaspoon      Tabasco sauce
   1      pound         London broil -- about 1 inch
                        thick
     1/4  cup           fresh-ground black pepper --
     1/4  inch          
   1      tablespoon    salt
   1      tablespoon    flour

Preparation:

In a small non-reactive bowl, combine onions, lime juice and Tabasco; cover and refrigerate for at least 2 hours but less than 6. Rub meat all over with pepper and salt. Sprinkle half the flour on each side of the meat. Sauté over high heat in a large sauté pan, with no oil, until well seared, 5 to 7 minutes on each side for rare. Remove from heat and serve in thickish slices, topped with generous portion of the marinated onions. Per serving: 210 calories, 5 grams fat.