Woody, this is a recipe I found on Cubacuban.com,
it doesn't call for grilled onions, just raw chopped ones, but I would probably just pan fry a bunch of onions after the steaks were cooked.
Palomilla Steak
INGREDIENTS (should serve 2)
* 2 x 10oz boneless sirloin steaks
* 3 cloves of garlic
* 1 tablespoon of olive oil
* 1/2 cup of diced white onions
* 1/4 cup of chopped fresh parsley
* the juice of one lemon
* salt (for taste)
PREPARATION
Chop up three cloves of garlic and rub into your two boneless sirloin steaks. Add some lemon juice, cover (with plastic wrap) and refrigerate for half an hour. Heat up some olive oil in a frying pan. Add some salt, for taste, to the steaks and then place them in the frying pan. Cook both sides, quickly, till done. Serve with chopped parsley, onion and a wedge of lemon garnish; and with white rice and/or fried potatoes.