I shared your post with my wife (Barbara), and we laughed, not at you, but the fun you have had with London Boil. It can be a really challenging cut of beef. The key is how you cut it. It must be against the grain (like 90 degrees). Marinating it helps a bunch, and I tend to do it at least 4 hours if not overnight. Tenderizers are great, but I can't use them since I have a gluten free kid. My Mom's recipe follows, I make this in one form or another using this recipe as a starting point:
Steak Siciliano
Top round, 2.5 to 3 inches thick
1 cup burgundy
1 small garlic clove or minced (or 5 times that much - my addition to the recipe)
1 TBS Worchestershire sauce
1/4 tsp Oregano
1 small onion minced
1/4 tsp black pepper
1 tsp kosher salt
2 TBS horseradish, minced
2 TBS chopped parsley
2 TBS prepared mustard
1 TBS table sugar
2 TBS olive oil
Sprinkle meat with tenderizer. Let stand 1/2 hour at room temp. Pour above mixture over meat and marinate for at least 2 - 3 hours in fridge, turning several times. Grill or broil to desired doneness (20 minutes (10 per side if 2 inches thick on 500*F grill)).
I aim for around 145*F, let it rest for 15 minutes under foil, then cut with a very sharp knife at an angle perpendicular to the grain.
The ones I did tonight were very thin, that's why I cut/chopped/added cheese in a large pot. Added to fluffy buns and some added A1 steak sauce. Yum.
Edit: Oh, don't be stingy on the wine. Depending on the container you put it in, I try and add enough wine to come up at least 1/2 way on the meat. That way it seems to wick better into the meat, and remember to turn it every few hours, unless you do it overnight. If I do that I turn it in the morning and then a few hours before I plan on grilling it.
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