A nice primer for the home cook on cooking steak with the sous vide technique.
With traditional cookery, when you are exposing your meat to temperatures much hotter than their final desired temperature (say, cooking a steak to 130°F in a 550°F skillet), timing is crucial. The center of your steak is getting hotter and hotter, and it’s your job as cook to take it off the flame at precisely the moment that it reaches the desired final temperature. Miss that precise moment, and dinner is ruined.
The beauty of sous-vide cooking is that since you are cooking your steak in a 130°F water bath to begin with, there is absolutely no chance your meat will ever get above that temperature. Guests are an hour late? No problem — leave the steaks in the water bath, and they’ll be exactly the same an hour later.