How Does Sous Vide Work?
Sous vide cooks food sealed in a bag in water held at a precise, low temperature by an immersion circulator, so food cooks evenly edge to edge and cannot overcook. You then sear it briefly for colour and flavour.
The basic idea
Sous vide, French for “under vacuum”, means cooking food sealed in a bag in a temperature-controlled water bath. An immersion circulator heats the water and keeps it at an exact temperature, so the food gradually reaches that same temperature and cannot go past it.
Why it works
Because the water never exceeds your target, a steak set to 54°C comes out a perfect medium-rare throughout, not overdone at the edges. The precise, gentle heat also keeps food juicy and tender, and timing is forgiving, an extra 30 minutes rarely hurts.
The steps
Season and seal food in a bag (vacuum-sealed or water-displacement), clip the circulator to a pot or container, set the temperature and time, and drop the bag in. When it is done, most foods get a quick, hot sear in a pan or with a torch for colour and crust.
Frequently asked questions
Do I need a vacuum sealer for sous vide?
Not always. A vacuum sealer gives the most reliable results, but the water-displacement method with a zip-top bag works for shorter cooks. Long or delicate cooks benefit from a proper seal.
Can you overcook food with sous vide?
Barely. Since the water never exceeds your set temperature, food cannot cook past it, though very long cooks can change texture. That forgiving margin is a big part of the appeal.