Patty in the Circulator
The burgers are made with beef that's lightly cured, ground, and collected such that the strands of beef emerging from the grinder are aligned lengthwise. They're then pressed into a long log and sliced into patties before being bagged and cooked at 54°C in a sous-vide style water bath.
Retrieving a Patty
Because of their vertically aligned grain, the patties come out quite tender in one direction (the direction you bite) but with a bit of chew when it actually breaks down in your mouth.
The patty after having been cooked, but not yet ready to eat (appetizing, right?). The beef they use is quite lean, but cooking sous-vide helps ensure that it doesn't overcook, keeping it relatively moist and tender nonetheless.
Into the Liquid Nitrogen
The burger patties are dipped into a liquid nitrogen bath for one minute.
Chilled and Ready
The idea is that by freezing just the very outer layers, you prevent the interior from overcooking in the subsequent step...
Into the Fryer
A pot of 200°C (about 400°F) oil sits on the stove next to the liquid nitrogen. The cook lifts the patty from the nitrogen bath and transfers it to a spider to slowly lower it into the hot oil.
Browned and Ready
It emerges with a relatively even golden-brown crust. Because of the nitrogen freeze, there should be very little overcooked meat underneath that crust. We'll see.
The cheese of choice here is a slice of constructed cheese made by emulsifying Comté with sodium citrate, allowing it to supposedly melt like an American slice with the help of a blowtorch. In this case, the cheese was soft and slightly melty, but not quite as gooey as a true American would have been.
The burgers are served Louis Lunch style on toasted bread (theirs is a homemade poppy loaf) with a tartar sauce-like spread made from reduced cream, shallots, and capers.
Ready to Eat
It's a fine looking sandwich. Burger-like? Not exactly, but a fine looking sandwich nonetheless.
As you can see, a nice even medium-rare from edge to edge. How did it taste? Well, it tasted... good. Not like a burger by any stretch, but pretty good. In my estimate, a minute spent in hot oil is not enough time or energy to develop the darker, thicker crust I like, and the lean beef doesn't deliver the mouth-coating richness I look for in a great burger, but as a sandwich in its own right, this thing has balanced flavor and interesting textures.
The fries start their life with a long, slow cook in a sous-vide water bath (again) in a bag filled with a salt and baking powder brine. The baking powder acts as an abrasive, roughing up the outside of the potato. I'd assume that the higher pH also acts to weaken the pectin that holds potato cells together, preparing the fries for their trip to the ultrasonic water bath that follows.
The goal of that bath, by the way, is cavitation: the creation of micro-fissures in the surface of the potato that add to its surface area when frying.
After the first fry you can begin to see tiny lines of cavitation, like the fry has a shell that can barely contain it.
The Second Fry
The fries are re-fried in hot oil, whereupon their exteriors rapidly break apart and puff out, creating a lacy, almost tempura-like finish to the exterior, but with no added starch.
Saucing it Up.
The sauce is a mousse-like emulsion made with bone-marrow.
You can see how crisp and lacy that exterior gets. As with the burgers, the final product here is a very interesting bite and quite tasty in its own right, though not particularly french fry-like. The center is ultra-creamy, almost like rich mashed potatoes, while the exterior tastes almost breaded—crumbly, and a little greasy, but very crunchy.
Starting the Milkshake
The milkshake begins with a case of bourbon that's been distilled using a rotary evaporator. That is, it's been evaporated at low temperature in order to extract the alcohol and leave behind a concentrated flavored liquid that has not been heated at all.
On its own, the bourbon distillate is intensely aromatic and quite sweet.
Just Another Dash...
A bit more liquid nitrogen to adjust...
Watch the Fumes!
The nitrogen chills the air rapidly, causing clouds of condensation to come rippling out of the chamber.
Ready to Serve
The shake comes out sippably-thick (just how I like it) with a great tangy, creamy, almost caramelized flavor that (thankfully) doesn't taste too strongly of bananas.