Jack Daniels Tennessee Honey London Broil. "London broil" originally referred to broiled flank steak, although modern butchers may label top round, coulotte, or other cuts as "London broil", and the term has come to refer more to a method of preparation and cookery than to a specific cut of meat .
The preparation of London broil typically involves marinating the meat for several hours followed by high heat searing in an oven broiler or outdoor grill. It is then served in thin slices, cut across the grain.

Chefs' Elite vacuum tumbler https://amzn.to/3AUeGt4
Royal Gourmet Grill https://amzn.to/3wCMMPO
Royal Gourmet Grill website https://www.royalgourmetcorp.com/

Recipe :
2 1/2 pounds of flank steak
50 ML of Jack Daniels Tennessee Honey Whiskey (or more if you like)
3/4 cup of oil
1/4 cup of apple cider vinegar
1/2 tsp of salt
1/2 tsp of black pepper
1 TBS of garlic powder
1/2 cup of green onion
Mix well and marinade for 4 to 24 hours or use the chef's Elite marinade for 15 minutes.