The Basics of Sous Vide Cooking

While you’ll seldom see the words ‘sous vide’ on their menus, this cooking technique — which literally means ‘under vacuum’ and was originally utilized in the early 1970s to minimize product loss when cooking foie gras — is being embraced by chefs worldwide for the preparation of an ever-widening array of dishes. With this technique, food is vacuum-sealed in a polymer pouch and then slowly cooked at low temperature. As a result, foods become tender without losing their original color, nutrients, or texture. 

Precise Temperature Control

From a purely functional standpoint, cooking is the use of heat to induce chemical reactions, with different reactions taking place at different temperatures. For example, the different proteins in the albumen of eggs coagulate at temperatures ranging from 141.8° to 183.2°F (61° to 84°C); just a few degrees difference in cooking temperature will greatly affect just how much the egg white solidifies. The texture of the egg yolk also changes as its temperature rises. 
Temperate affects meat in a similar manner. Cuts with high collagen content, such as chuck and brisket, should be cooked longer and to higher temperatures to adequately break down this tough connective tissue. Those with little connective tissue however (such as prime rib), can begin to get tough if cooked to those same temperatures. Just a few degrees can make a difference in an expensive cut of meat, turning it from tender and moist to tough and stringy. 
The ‘art’ of sous vide cooking is in determining the perfect ‘core’ temperature you need to reach to achieve the desired taste and texture. Take for example, a dish that features an egg with a creamy, custard-like texture. One chef might cook that egg to a core temperature of 143°F (61.7°C), while another may prefer cooking it to 146°F (63.3°C). While the finished eggs may be basically the same, there will be also be subtle differences that make each chef’s dish unique. 
The importance of precise temperature control underscores why the PolyScience Thermal Circulator is critical to sous vide cooking. Unlike slow cookers or simmering pans of water, the thermal circulator offers extremely precise temperature control along with ‘set it and forget it’ convenience. It can be set to cook food to an extremely precise core temperature — within a fraction of a degree — with just one single adjustment. You simply set it for the desired temperature, add the food, and walk away. Maintaining a slow cooker or pan of simmering water at just the right temperature is a very timeconsuming, hands-on process. Also, because they don’t circulate the cooking liquid, these devices can develop hot and cool zones that adversely affect the cooking process. 

Cooking Time

Cooking times with the sous vide technique are affected by a number of factors, including the initial temperature of the food, its mass, and heat transfer characteristics. Remember however, that it’s low temperatures for long periods of time that make the tantalizing results of sous vide possible. As a result, it will take some testing and experience to determine the proper amount of time needed for a dish to reach the desired ‘doneness’. 
In general, cooking time is affected by three factors: (1) the core temperature you wish to cook the dish to; (2) the heat transfer characteristics of the food; and (3) how much food will be cooked at one time. For example, meats – which do not conduct heat particularly well – will require longer cooking times than foods such as vegetables which are much less dense and offer greater relative surface areas. Also, the greater the cooking liquid to food ratio, the faster each portion of food will reach the proper core temperature. PolyScience recommends that when cooking sous vide, that the cooking pouches be completely covered with liquid and that there is sufficient room for the pouches and cooking liquid to circulate freely.
Another important advantage of slow, low-temperature sous vide cooking: you can’t inadvertently overcook a dish by leaving it in longer than necessary. Once a dish reaches the desired temperature, it stops cooking. And it can be kept at that temperature — moist, delicious, and ready-to-serve — for hours without shrinking, drying out, or becoming tough. This is particularly advantageous when cooking expensive cuts of meat, such as Kobe/Wagyu beef.

Enhancing Presentation

The enjoyment of food, be it a quick snack or a multi-course tasting menu at a fine restaurant, is a unique and very personal experience. To be truly fulfilling, it must please the senses — sight, smell, taste, touch, and even hearing. Who among us hasn’t had our expectations heightened by the artistry of the presentation, the aroma wafting from the plate, or the sizzle of a hot dish? To complement and enhance its melt in the mouth tenderness, many chefs ‘finish’ sous vide meat dishes with a brief grilling or pan/blowtorch searing, inducing a Maillard reaction and thus creating the familiar aromas and flavors that come only with high-heat cooking. The critical difference with food cooked using the sous vide technique and finished in this manner is that the interior remains exceptionally tender and moist and there is very little, if any, of the shrinkage that occurs with traditionally grilled or roasted meat.

Cooking Sous Vide

The sous vide cooking process is quite simple and basic: (1) Set the Thermal Circulator or Thermal Bath to the desired cooking temperature and heat the cooking liquid. (2) Vacuum seal the food. (3) Place the vacuum sealed food in the heated cooking liquid; the Thermal Circulator or Thermal Bath will apply additional heat as needed to maintain the cooking liquid at the desired temperature. And remember, while you can’t inadvertently over-cook a dish with the sous vide method, you can under-cook it if you remove it from the heated cooking liquid before it reaches the desired core temperature.
Disclaimer: The information presented above reprinted with permission from PolyScience and is for informational purposes only. As with any cooking method, proper food safety procedures should be followed.
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