Heat the cast iron pan

• Heat the cast iron pan over medium-high heat.
• Add the beef tallow and let it melt.

Season the steak

• Pat the steak dry.
• Season both sides with salt, garlic powder and pepper, pressing the seasoning in.

Sear the first side

• Place the steak in the hot pan; it should sizzle immediately.
• Cook for 3 to 4 minutes for medium rare.

Flip and baste

• Flip the steak.
• Add the butter and baste, turning the heat down.
• Flip back over to get a better sear on the first side.

Rest and finish

• Let the steak rest for about 5 minutes.
• Top with flaky sea salt before serving.