In a mixing bowl combine the soy sauce, Worcestershire sauce, lemon zest, lemon juice, honey, balsamic vinegar, pepper, pepper flakes, and garlic. Mix until combined.
Place the steak in a Ziploc bag, pour the marinade into the bag and seal removing as much air as possible. Marinate in the refrigerator for at least 4 hours but up to 12.
Once the steak is ready from from the refrigerator and allow to warm up while you heat the grill. Cook each side for 4-5 minutes. Check the internal temp. To cook further finish cooking with indirect heat. See notes for internal temperatures for degree of doneness.
Allow to rest for 10 minutes before slicing.
Notes
Internal cooking temperatures degree of doneness:Rare - 125°F or 52°CMedium Rare - 135°F or 57°CMedium - 145°F or 63°CMedium Well - 150°F or 66°CWell - 160°F or 71°C