Trim skirt steak and pat dry.
Combine the marinade in a large shallow bowl.
Add the skirt steak, coat well, and marinate for about an hour (or keep it in the fridge until ready to grill if you think it will take more than an hour). If it will take more than an hour, marinate it in the refrigerator.
Preheat the grill to medium-high.
Thirty minutes before grilling, drain the marinade from the skirt steak and pat dry with paper towels (for that delicious Maillard reaction).
Clean and oil the grill grates. Place the skirt steaks on the hot grates and grill for 3-5 minutes per side for rare to medium-rare, depending on preferences—the less cooked, the better.
When ready, transfer it to a wooden cutting board and let it rest for 2-5 minutes. Thinly slice the skirt steak against the grain and enjoy.