Start by setting your sous vide to the desired temperature. I typically cook beef steaks at 55 degrees Celsius (131 degrees Fahrenheit), which gives a nice medium rare.
Season the meat with salt and pepper on both sides.
Vacuum seal the meat, you can easily place them in the same bag, just make sure there's space between them.
Cook them for 2 hours in the water bath. The thicker they are, the longer they need to cook. If you have 5 cm thick steaks, I recommend 3 hours in the water bath.
Remove the meat from the vacuum bag and dry it well, either with paper towels or a clean dish cloth.
Heat a pan or grill to the highest possible temperature, since you only need to sear the meat - it's already cooked. Too high heat for too long will overcook the meat.
The meat only needs to be seared for about 30-45 seconds on each side.
If you're using a pan, add oil to the pan and when the meat is on, add a dab of butter as it cooks. If you're using ghee, just add it at the same time as the meat.
Take the meat off the pan/grill and it is ready to serve.
Add freshly ground pepper on top and sprinkle with flake salt.
Bon appétit.