Thaw meat in the fridge on paper towel lined plate. Change the paper towels out a time or 2 until the meat is thawed. This will help remove any off flavors and will help in the browning process. Let steak sit at room temperature for 30 minutes before cooking.
Heat cast iron pan over high heat. While pan is heating, season meat generously on one side with salt and pepper. Add lard to pan.
Allow lard to get hot, about 30 seconds. Put steak seasoned side down in the pan. Season the other side of the steak and cook 2.5-3.5 minutes.
Flip steak and add butter, thyme, and garlic cloves to pan. Allow the herbs and garlic to season the butter as it melts, about 30 seconds.
Place thyme and garlic on top of steak and continuously pour hot butter over steak until 2.5-3.5 minutes have passed. 2.5 minutes per side will give you a steak on the rarer side. 3.5 minutes will be closer to medium rare. Time will vary greatly depending on the thickness of the steak. Once the internal temperature reaches 120°F, it's time to pull it out of the pan.
Remove steak from pan and let rest for 10 minutes on a cutting board or plate. Slice into ¼-½" slices and serve with butter from the pan. Enjoy!
Notes
This cooking method works for any type of steak. Use whatever works for you!
I like to use homemade lard to cook steak, but you can use whatever cooking fat you prefer.
Make sure to use whole garlic cloves, and smash them to release their natural juices and get the most out of their flavor.
Fresh thyme can be substituted with fresh rosemary if you'd like.
Make sure to remove all silver skin before cooking.
To prevent overcooking, keep your backstrap as a loin while cooking, and cut it into strips or medallions after cooking if desired.
Use a meat thermometer to ensure your steak reaches somewhere between 125°F and 150°F, depending on your preferred doneness.
Letting your steak rest is key to keeping your steak juicy and flavorful. If you cut it too soon, a lot of the juices will run out of the steak.