Bring steaks to room temp: Take the steaks out of the fridge 30–45 minutes before cooking. Pat very dry with paper towels.
Dry surfaces sear better.
Season boldly: Sprinkle kosher salt and pepper all over, including the sides. Use more than you think—some will remain in the pan.
Preheat the pan: Set a cast-iron skillet over medium-high heat for 3–5 minutes until very hot. Add the oil and heat until it shimmers.
Sear the first side: Lay steaks in the pan away from you.
Don’t move them for 2–3 minutes, until a deep brown crust forms. If the pan looks dry, add a little more oil.
Flip and sear the second side: Turn the steaks and cook another 2–3 minutes. Sear the fat cap and edges briefly by holding with tongs.
Add flavor boosters: Drop in 2 tablespoons butter, smashed garlic, and herb sprigs.
Tilt the pan and spoon hot butter over the steaks for 60–90 seconds. This bastes in flavor and helps even cooking.
Check temps: Use an instant-read thermometer. Aim for: Rare: 120–125°F
Medium-rare: 130–135°F
Medium: 140–145°F
Medium-well: 150–155°F
Rest the steaks: Transfer to a warm plate or cutting board and rest 5–10 minutes.
Don’t skip this—resting keeps juices in the meat.
Make the pan sauce (optional but awesome): Lower heat to medium. Add the remaining 2 tablespoons butter to the skillet with a splash of lemon juice, white wine, or water, plus Worcestershire or soy if using. Stir and scrape up browned bits until glossy, 30–60 seconds.
Slice and finish: Slice against the grain or serve whole.
Spoon the garlic-herb butter and pan sauce over the top. Finish with a pinch of flaky salt if you like.