Season steak well. Pat the steak dry with paper towels, then season generously on both sides with salt and pepper (or your preferred seasoning).
Heat pan hot. Place a heavy-bottomed skillet or cast-iron pan over high heat and let it heat until very hot and just beginning to smoke.
Sear first side. Lay the skirt steak in the pan and cook without moving it for 2 to 3 minutes, until a deep brown crust forms.
Rest the steak. Transfer the steak to a cutting board and let it rest for 5 minutes to allow the juices to redistribute.
Slice against grain. Cut the skirt steak thinly across the grain and serve immediately.
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