Ultrasonic French Fries

16 Jul

It’s one of the most commonly consumed snacks in the Western world and has been made in one form or another for at least three centuries, so you might think nothing new could come of the humble french fry. But British chef Heston Blumenthal put paid to that notion years ago. He and his research chef Chris Young came up with a triple-cooked “chip” with a taste and texture that blow away anything you will find at a burger joint. Other chefs have raised the bar further. Nils Norén and Dave Arnold of the French Culinary Institute in New York City, building on work by a Polish researcher, figured out how to improve the texture inside fries by treating the potatoes with an enzyme. The chemical helps break apart the pectin in the fries, yielding a smoother mouthfeel.

Inspired by these heroic efforts, Maxime Bilet, Johnny Zhu and the other research chefs (including Young) at our culinary lab in Belle­vue, Wash., explored a variety of techniques for doing better still. The winning combination is simple in its ingredients but quite fancy in its execution. The potato batons are vacuum-sealed with 2 percent salt brine in bags to keep them intact during boiling. They are then bombarded with intense sound waves from the same device that dentists and jewelers use. A lengthy ultrasound treatment at 40 kilohertz causes the surface of each fry to crack and blister with myriad tiny bubbles and fissures.