Grill it over very high heat, about 3β4 minutes per side for medium-rare. It's thin, so it cooks fast. Rest a few minutes after cooking. Slice it thin against the grain.
Skirt steak takes marinade beautifully, a simple mix of lime, garlic, cumin, and olive oil for 1β2 hours makes a big difference. Bold enough flavor to hold up to strong seasonings.
Skirt steak comes from the diaphragm muscles, a long, flat cut with a pronounced grain and intense beef flavor. Ounce for ounce, it might be the most flavorful cut on the animal.
Keep frozen until ready to use for up to 12 months. Thaw in the refrigerator overnight, or quick thaw in a bowl of cold water if you're in a hurry (just keep it in the sealed package). Keep thawed skirt steak in the fridge for 1-2 days, or refreeze immediately if not using.