Season steak with salt and pepper
Preheat sous vide water bath to desired temperature
Place steak in a vacuum-sealed or zip-top bag
Add herbs, garlic, or butter if desired
Remove as much air as possible from the bag
Submerge the bag in the water bath
Cook for 1 to 3 hours, depending on thickness
Remove steak from the bag
Pat steak completely dry
Sear steak in a very hot skillet or on a grill for 30 to 60 seconds per side
Rest briefly if needed
Slice and serve