Foodservice operators from many segments have turned to sous vide to produce foods with superlative flavor, tenderness and consistency while solving a number of their operational problems.
“Sous vide” means “under vacuum,” and that’s the heart of the system: cooking food portions in bags from which air has been forced out. The packets of meats, fish, vegetables or other foods cook and pasteurize in a constantly circulating warm-water bath at a lower temperature and for a longer time than in other methods. Salt, seasonings and sometimes oil are put right into the bag with the other ingredients, forcing their intense flavors into the food.
If employees don’t serve the food immediately, they can chill the bag of cooked food in an ice-and-water bath before refrigeration. Because these chilled bags can be stored in a refrigerator for 48 hours or more, sous vide allows operations to shift production labor to earlier in the day or week, or cook consistent batches in a centralized commissary to send out to multiple locations. When it’s time for service, staff can quickly retherm cooked proteins and sides in a warm bath and then plate and garnish them.
Sous vide cooking can help operators with a variety of needs and challenges. A fast-casual Mexican concept can slow-cook pulled chicken, pulled pork and carne asada in bulk, then assemble tacos to order at meal times. A wedding caterer can pack a tank and immersion circulator to take to the reception site, then assemble plates of precooked and rethermalized beef, chicken or fish for a few dozen or a few hundred guests. A hospital or nursing home can be assured that meals are flavorful, nutritious, consistent and free of external pathogens; plus codes on bags help ensure that the right foods get to those with special diets.
Equipment For Sous Vide
While sous vide in its simplest form involves nothing more than plastic freezer bags, a pot, a stove burner and an immersible thermometer, dedicated precision equipment has made it much easier. Immersion circulators that drop into a dedicated sous vide tank constantly heat and agitate the water bath, maintaining even temperature within half a degree or less. At least one manufacturer offers a basin with a built-in thermal circulator instead of a separate, drop-in immersion circulator.
Many companies that sell immersion circulators also supply stainless, aluminum or polycarbonate tanks, and many have a full system including the heat-rated boilable bags, a vacuum bag sealer and tape or label printers to identify or color-code the contents of each packet.
The latest technology also makes HACCP compliance easier. Some immersion circulators record time-and-temperature data and even generate HACCP reports. To document core temperature for HACCP tracking, employees can insert optional probes into food bags without breaking the vacuum (first applying a patch of a special foam tape where they plan to insert the probe). The probe attaches to a data logger or the immersion circulator itself. Using multiple probes, staff also can simultaneously heat different foods with various cook times.
One manufacturer has introduced an RFID feature to the sous vide cooking process. It helps operators better manage individual bags with different cook times in one water bath, for example. Instead of marking bags or using a multi-timer, you clip the RFID tag onto the bag, scan it with the RFID reader, then drop it into the water bath. The RFID reader uploads the data to a tablet. Anyone monitoring the bags in the kitchen can check the tablet and know when a product has finished its cook time and pull it from the water bath.
How To Choose
Follow these tips when specifying immersion circulators and tanks.
- Choose the right size for your needs. Foodservice operations typically need an immersion circulator that uses 1 kW or more of electrical power. Tanks appropriate for foodservice range from about 3.4 gal. to 15.3 gal.; smaller units may be portable, while larger ones should be for a regular cooking station. Make sure the immersion circulator is the right size for the tank. A too-powerful unit will agitate the water excessively, while a too-small circulator will not heat water consistently throughout the tank.
- Evaluate the level of programmability. Immersion circulators range from fully manual (cooks can set the time and temperature for each recipe) to dozens of pre-sets plus customizable programs. Some allow employees to download data from the immersion circulator to print labels for the food bags.
- Think about accessories. Some tanks come with a rack to properly position the food bags for efficient water circulation. One or more probes will allow employees to directly track core temperatures of foods.
- Look for independent certification, such as NSF. At least one manufacturer offers an immersion circulator with NSF certification; another company offers it on its water tank and cover.
- Take durability into account. This is a factor in the price of both the immersion circulator and the tank and how heavily employees will use the equipment. Choose from a number of materals and price levels for the water tank, from polycarbonate to heavy-duty dual-walled steel tanks.
- Consider energy costs. A tight-fitting lid on the tank helps conserve heat. Double-wall steel tanks hold heat better.
- Ask about the warranty and repair options. Some manufacturers ship parts or send an authorized service agent to the foodservice site; others require operators to return the immersion circulator or tank to the factory, leading to substantial downtime. For more on warranties, see “What To Know About Warranties” on pg. 42.
- Consider the company’s product line and how long it’s been supplying sous vide equipment. A number of suppliers tout their complete solution, including the core equipment along with vacuum bag sealers, bags and other supplies. Some companies have been in the sous vide business for years and have extensive documentation and chef expertise.
SOUS VIDE IN ACTION
The success of Starbucks’ popular Sous Vide Egg Bites has restaurants of all sizes touting this cooking preparation as a differentiator.
200+ locations, New York City-based
In February, Danny Meyer’s chain, better known for burgers, made headlines with the nationwide rollout of its Chick’n Bites. Calling out the sous vide cooking “for optimum flavor, moisture and texture” sets Shake Shack’s apart from chicken nuggets on other fast-food menus.
SOUS VIDE KITCHEN
1 location, New York City
This self-described “virtual food hall” actually is a brick-and-mortar eating space serving five different menus—on which all the dishes are cooked sous vide. Customers order at centralized kiosks. The variety of offerings—including Latin-, Mediterranean- or barbecue-style rice, grain and salad bowls topped with sous vide-prepared meats—shows the diversity of cooking that thermal circulators allow.
9 locations, New York-based
In announcing its franchise expansion plans last year, this chain pointed to its partnership with a menu developer specializing in sous vide techniques to ensure consistency and quality control of its menu items, including its signature shawarma.
1 location, Hamden, Conn.
Sous vide preparation is the hook at this new fast-casual “better chicken sandwich” spot from Eli’s Restaurant Group. Roost boasts on its website that its chicken is delivered fresh and then cooked vacuum sealed in a water bath at a precise temperature “so that we consistently produce a perfectly tender and juicy piece of chicken.” The chicken is offered in six different sandwich options, including K-Pop Chicken (featuring Korean fried chicken) and Carolina Buffalo (with fried chicken, Buffalo sauce, bleu cheese and celery slaw).
3,300 locations, Atlanta-based
The meat-centric chain uses sous vide cooking to roll out unusual proteins—including duck, venison and pork belly—on a large scale for its limited-time offers. “You sear the protein and then it goes through the sous vide process for many hours, so this keeps it from breaking down, keeps it super moist and it drives in a lot of concentrated flavor,” the chain’s V.P. and Brand Executive Chef told Food Business News last year. “You also are able to exactly pinpoint the product temperature range you want for this protein in each restaurant with this method.”
VOLLRATH THERMAL IMMERSION CIRCULATOR
Vollrath’s Sous Vide Thermal Immersion Circulator is available as part of a complete cooking unit with a water bath and cover or as just a thermal immersion circulator head. It has temperature stability to 0.1°F for precise results and reaches a maximum temperature of 200°F. It has 2 pump speeds for flexible cooking and 3 programmable settings. The immersion circulator complements Vollrath’s In-Chamber and Out-of-Chamber Vacuum Pack machines and bags along with countertop cooking equipment to provide a complete sous vide prep and cooking solution.
SAMMIC SMARTVIDE 8 PLUS
Sammic’s SmartVide 8 Plus now offers radio frequency identification—or RFID— tagging of each individual product being cooked. Core probes optional. Bluetooth connectivity allows for export or printing of cooking results at the end of each cycle, making HACCP control easy. All SmartVide immersion circulators come equipped with a precise temperature control system for consistent results. Four buttons and full-color TFT display offer all needed information at a glance. Easily take immersion circulators from one container to another. Maximum container capacity of SmartVide 8 Plus is 14 gal. Temperature range is 41°F-203°F.
POLYSCIENCE PROFESSIONAL CHEF SERIES
PolyScience’s Sous Vide Professional Chef Series immersion circulator meets chef requirements, adds a new dimension of control to the kitchen and stands up to the demands of high-volume operations. Compact design makes for easy storage. The immersion circulator clamps onto any pot or tank (up to 8 gal.) with round or flat walls. A large backlit LCD panel displays set temperatures and current temperatures. Features include pump-flow regulation, auto-restart and ability to calibrate to reference standard. Maximum temperature is 200°F.
Diamond Immersion Circulators have the standard features of the Pearl line plus pre-programmed memory keys for meat, fish and vegetables—each with 5 temperature presets that employees can edit. When used with the core temperature sensor, Diamond emits an alarm to signal that a product has reached the selected core temperature. Software enables employees to control and log HACCP-relevant data for up to 24 units simultaneously; timers can be started separately. Temperature range is 68°F-203°F; units are NSF certified.
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