Pat steaks dry and all sides.
Rub steaks with salt and pepper on all sides.
Smash garlic cloves.
Roll rosemary sprigs in your hands to release oils.
Add garlic cloves and herbs on top of steaks.
Place steaks in Food Saver bag and add olive oil to the bag.
Vacuum seal to get as much air out as possible.
Fill a large pot of water, and turn on your sous vide to heat the water to 130 degrees (for medium rare)
Cook steaks in water for about 1 to 2 hours.
Remove from water and allow to sit for about 10 minutes.
Heat a cast iron over medium high to high heat.
Spread butter or olive oil all over the cast iron.
Sprinkle all sides of the steaks with salt and pepper.
Add steaks to cast iron pan and cook on each side for about 1.5 minutes until a light crust is formed and the color and the texture on the exterior is dark.
Allow steaks to set for about 5 minutes on a cutting board before serving hot.