Step 1

Prepare sous vide water bath for 125°F.

Step 2

Season steak liberally with salt.

Step 3

Place steak in sealable bag, putting 3 tablespoons of compound butter on either side of the steak. Seal bag.

Step 4

Submerge sealed bag into sous vide bath and allow water temperature to return to the selected 125°F. Make sure bags stay submerged.

Step 5

Allow steak to sit in water bath for 3 hours.

Step 6

Just before steak is done in the sous vide, prepare your cast iron skillet and heat it up to 450°F-500°F.

Step 7

Remove steak from water bath and pat dry with a paper towel. Slice a small piece of fat from the steak and put it on the hot cast iron surface, allowing it to render.

Step 8

Place steak directly onto the rendered fat in the hot cast iron surface and sear for 90 seconds, on all four sides.

Step 9

Remove steak from pan, let rest for 5-10 minutes.

Step 10

Slice cross-ways and serve.