Flash

Flash refers to quickly cooking or reheating food using high heat for a short duration—typically 2-10 minutes—to raise its temperature without overcooking. This technique is essential when a protein comes off the grill slightly undercooked or when pre-portioned dishes need to reach serving temperature during high-volume service.

Chefs flash food in a very hot oven set between 425-475°F, under a salamander broiler, or in a screaming-hot pan. The intense heat penetrates quickly while minimizing additional cooking time. For moist foods like braised meats or poultry, chefs cover the protein with pan juices and aluminum foil to prevent drying during the flash.

When to Flash Food

The expo typically calls for a flash when a steak returns from the dining room undercooked or when a dish sits too long dying on the pass. Catering operations rely on flashing to serve large quantities of hot food without timing every plate at the last second. Instead of cooking 200 chicken breasts to order, caterers can prepare them to 90% doneness, then flash each portion as needed.

Food must be in individual portions, thin slices, or shallow layers for effective flashing. A whole roast won’t flash properly—the exterior will burn before heat reaches the center. Single steaks, sliced brisket, or portioned fish fillets work perfectly.

Flash Frying Technique

Flash can also describe flash frying—quickly submerging food in oil heated to 350-400°F for 30 seconds to 5 minutes. This creates a crispy exterior while sealing moisture inside. Flash frying uses less oil and shorter cooking time than traditional deep frying, resulting in less oil absorption and a lighter texture.

Restaurants flash fry pre-cooked items like crab cakes or twice-cooked french fries. The first fry cooks the interior; the flash fry at service creates the crispy shell. This technique appears frequently when a dish needs to be prepared on the fly during a rush.

Flashing vs. Regular Reheating

Regular reheating uses moderate heat (250-350°F) over longer periods, which continues cooking the food and can dry it out or turn proteins rubbery. Flashing minimizes this risk by getting in and out quickly with high heat. A steak flashed for 3 minutes under the salamander hits serving temperature without cooking past medium-rare. The same steak reheated conventionally for 10 minutes would turn medium-well.

The technique requires judgment. Unlike kill it orders where you intentionally overcook meat, flashing demands precision timing. Check temperature with a probe thermometer rather than guessing—especially during service when tickets are piling up at the pass.