Trim two sirloin steaks about 8-10 oz each. Use a mechanical meat tenderizer if available to prep meat. If not available, use a narrow knife and puncture each side about 20 times. Place meat in marinade and refrigerate for about 2 hours (1-4 hour range).
Preheat on high. Clean and oil grill. Grill with lid closed over high heat for 5 minutes and turn.
Continue until you reach the internal temp of your choice. I went for 140-145. Cooking time will vary due to the thickness and grill variables. 8 to 14 minutes for most people.
Remove and let rest for 5 minutes.
Top Sirloin is best for this recipe.
I used both chemical and mechanical tenderization. You can skip one or both if you wish, but the steak will be less tender.
The marinade is good in one hour but better in 2-4 hours.
Thicker sirloin will take longer to cook.
Please be sure to use an instant-read thermometer to get the results right for you. Never cook steak by time alone. Time is provided only to help in your planning, not as the exact cooking time. The variables of the grill, the meat temperature, meat thickness, and other things can change the cooking time.