Sous Vide Proteins — Temperature Tables and Finishing

Sous vide (French: 'under vacuum') is a precision cooking method in which food is sealed in vacuum or zip-lock bags and immersed in a temperature-controlled water bath at exactly the desired final internal temperature for a defined period. Unlike conventional cooking, where the food's internal temperature chases a much higher ambient temperature, sous vide achieves equilibrium — the food reaches the water bath temperature and cannot exceed it, producing predictable, reproducible results that are impossible with conventional heat. The science relies on protein denaturation kinetics. Proteins do not denature instantaneously at a threshold temperature but progressively across a range, with the extent of denaturation increasing with both temperature and time. Myosin — the primary muscle protein — denatures at 50–55°C, producing firmness; actin denatures at 65–70°C, producing toughness and dryness. Sous vide exploits this by holding proteins at temperatures above myosin denaturation but below actin denaturation, producing tender, juicy results impossible to achieve by conventional methods. Key temperature targets: beef medium-rare at 55–57°C; pork medium at 60–63°C; chicken breast safe and moist at 63–65°C (held for pasteurisation time, not just reaching temperature); salmon silky and barely set at 45–50°C. Time is a secondary variable — longer times at the same temperature increase pasteurisation effect and can change texture over hours (a 24-hour chuck at 57°C tenderises significantly more than a 4-hour hold at the same temperature as collagen converts slowly). Finishing after sous vide is mandatory for most proteins: the surface must be seared in a very hot pan (or with a torch) for 30–60 seconds per side to develop Maillard flavour and caramelisation. The sous vide surface is wet — patting dry with paper towels and sometimes using a drying agent (baking soda) ensures rapid crust development with minimal additional cooking of the interior.