How Sous Vide Works
Sous vide (French for "under vacuum") involves vacuum-sealing food in a bag and cooking it in a precisely regulated water bath. This low-temperature, long-time cooking method produces results that are impossible to achieve through any other culinary technique.
Because the water bath never exceeds the target temperature of the food, it is mathematically impossible to overcook your protein. A steak cooked at 130°F will be perfectly medium-rare from edge to edge, with no gray band.
Why Is There a Time Range?
In traditional cooking, time is used to control temperature. In sous vide, temperature is controlled directly by the water bath, and time is used to control texture.
- Minimum Time: The time required for the core of the food to reach the target temperature of the water bath. This depends heavily on the thickness of the cut.
- Maximum Time: The longest you should leave the food in the bath before the prolonged heat breaks down the muscle fibers too much, resulting in a mushy texture.
As long as you pull your food out anywhere between the minimum and maximum time, it will be perfectly cooked.
Food Safety & Searing
For temperatures below 130°F (54°C), such as rare steak or soft fish, you should not cook for longer than 2-2.5 hours to prevent bacterial growth. For long cooks (like 24-hour roasts), always ensure the water bath is set to at least 130°F.
Since sous vide cooking does not brown the outside of the meat, you will want to finish your protein with a hard sear. Pat the food completely dry with paper towels, then sear in a ripping hot cast-iron skillet for 60 seconds per side, or use a culinary torch.