Why Some Cold Cuts Make Iridescent Meat Rainbows—and Why They're Still OK to Eat

Kirill Ignatyev, Flickr // CC BY-NC 2.0
Kirill Ignatyev, Flickr // CC BY-NC 2.0

We eat with our eyes first, and sometimes what we see on our plate turns us off a meal altogether. Take so-called “meat rainbows”: They happen when a slice of deli meat takes on an iridescent shimmer reminiscent of an oil puddle in a parking lot—a.k.a. not something you want on your sandwich. Despite giving a whole new meaning to the phrase "mystery meat," the odd discoloration is perfectly safe to eat, as physicist Dave McCowan at the University of Chicago explained for The Takeout.

The colorful sheen on a slice of roast beef or pastrami isn’t a sign of spoilage or chemical additives—it’s actually a result of the way the meat is cut. Slicing meat “against the grain” means cutting through, rather than parallel to, the bundles of fibers composing the meat’s musculature. This makes for a more tender bite, and it also leaves a grid of evenly-spaced meat fibers. In the right light, this surface lends itself to something called “diffraction.”

Diffraction occurs when light hits a repeating pattern of nooks and crannies. As the white light bounces off the grooves in the meat, it separates into a spectrum of distinct colors. Some of these colors are amplified, creating a mother-of-pearl appearance when viewed together. This is the same effect we see on the backs of CDs and DVDs.

Another possible culprit behind your rainbow meat is thin-film interference. This is sometimes present in meat with a thin layer of oily fat on the surface. The film affects the light passing through it in such a way that only some of the colors in the spectrum come through, hence the rainbow. This phenomenon produces a sheen closer to that of bubbles or oil slicks than laser discs.

Why do meat rainbows only seem to show up in deli slices, not raw cuts? The answer lies in the curing process. A cured ham is likely greasier than a raw pork cutlet, which makes thin-film interference more likely. The muscle fibers in cured and cooked meats are also more tightly packed together, producing the rigid grid necessary for diffraction.

Color also plays a role. Iridescent shimmers are easier to spot on darker meats like beef and some pork—so if you’re eating a slice of turkey from the deli, it could be covered in meat rainbows you don’t notice. We’ll let you decide if that’s a positive thing.

[h/t The Takeout]

The ChopBox Smart Cutting Board Has a Food Scale, Timer, and Knife Sharper Built Right Into It

ChopBox
ChopBox

When it comes to furnishing your kitchen with all of the appliances necessary to cook night in and night out, you’ll probably find yourself running out of counter space in a hurry. The ChopBox, which is available on Indiegogo and dubs itself “The World’s First Smart Cutting Board,” looks to fix that by cramming a bunch of kitchen necessities right into one cutting board.

In addition to giving you a knife-resistant bamboo surface to slice and dice on, the ChopBox features a built-in digital scale that weighs up to 6.6 pounds of food, a nine-hour kitchen timer, and two knife sharpeners. It also sports a groove on its surface to catch any liquid runoff that may be produced by the food and has a second pull-out cutting board that doubles as a serving tray.

There’s a 254nm UVC light featured on the board, which the company says “is guaranteed to kill 99.99% of germs and bacteria" after a minute of exposure. If you’re more of a traditionalist when it comes to cleanliness, the ChopBox is completely waterproof (but not dishwasher-safe) so you can wash and scrub to your heart’s content without worry. 

According to the company, a single one-hour charge will give you 30 days of battery life, and can be recharged through a Micro USB port.

The ChopBox reached its $10,000 crowdfunding goal just 10 minutes after launching its campaign, but you can still contribute at different tiers. Once it’s officially released, the ChopBox will retail for $200, but you can get one for $100 if you pledge now. You can purchase the ChopBox on Indiegogo here.

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Move Over, Mister Softee: Margarita Trucks Are Bringing Cocktails to Your Doorstep

The margarita man cometh.
The margarita man cometh.
Camrocker/iStock via Getty Images

If anything could possibly rival the appearance of an ice cream truck on a sweltering day, it would be the sight of a similar automobile emblazoned with the word margarita heading down your street.

Residents of San Antonio, Texas, can now make that dream a reality. La Gloria, a restaurant owned by chef Johnny Hernandez, is bringing its signature margaritas and other popular menu items right to people’s doorsteps by way of bright pink “Margarita Trucks.”

MySA reports that the first truck has already started making deliveries within 3 miles of Crockett Park in downtown San Antonio, but additional trucks will venture as far as Dominion, Stone Oak, Alamo Heights, and other neighborhoods in the coming days.


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“Today, safety is top of mind for everyone, and many of our customers are simply not ready to dine out,” Hernandez said, according to KSAT.com. “However, we know that doesn’t mean they don’t crave one of our famous margaritas.”

Those famous margaritas include La Gloria’s house recipe (on the rocks or frozen), as well as a variety of other refreshing flavors like prickly pear, mango, cucumber, and strawberry. The truck will also be stocked with a selection of taco kits and snacks like street corn, chips, salsa, and queso, and customers must purchase at least one food item with their alcoholic beverage.

Unlike ice cream trucks, the margarita trucks won’t exactly be cruising around town, ready to pull over for any spontaneous customer. Instead, they’ll operate more like regular food delivery services—you have to order and pay online in advance, and there’s an order minimum of $40.

While you’re waiting for some enterprising restaurateur to launch a fleet of margarita trucks in your city, learn how to make your own margarita at home with these priceless tips from a cocktail pro.

[h/t mySA]