Why Do Crabs and Lobsters Turn Red When You Cook Them?

iStock / Creativeye99
iStock / Creativeye99

While they might be bright red when they hit your dinner plate, crabs and lobsters are usually brown, olive-green or gray when alive and in the wild (at least in the mid-Atlantic U.S.; crustaceans farther south come in a variety of vibrant colors). The dramatic color change during cooking has to do with the way certain biochemicals inside the shellfish react to heat.

Lobsters and crabs have a pigment called astaxanthin in their shells. Astaxanthin is a carotenoid pigment: absorbing blue light and appearing red, orange or yellow in color. While the crustaceans are alive, astaxanthin lies wrapped in the tight embrace of a protein called crustacyanin. The protein holds the pigment so tight, in fact, that it’s flattened and its light-absorption properties are changed. The astaxanthin-crustacyanin complex then winds up giving off a blue-green color.

These biochemical cuddle buddies get separated when a crab or lobster is cooked. Crustacyanin is not heat-stable, so introducing it to a boiling pot of water or a grill causes it to relax its bonds with astaxanthin, unravel and let the pigment’s true bold red color shine through.

An estimated 1 in 100 million lobsters are albino and don’t have any pigments in their shell. They’ll go cooked to the dining room the same color they went live into the pot: a ghostly gray-white.

Shrimp also have carotenoid pigments in their shells and flesh, and these are also hidden until they’re released by heat. So how do flamingoes, with diets heavy with carotenoid proteins but which usually don’t have kitchen access, take on the bright pink of their dinners’ pigments without cooking them? The proteins that mask the pigments not only unravel in the presence of heat, but also dissolve thanks to the acids and fats inside flamingos during digestion. The freed proteins then give birds’ feathers a soft pink hue.

This Course Will Teach You How to Play Guitar Like a Pro for $29

BartekSzewczyk/iStock via Getty Images
BartekSzewczyk/iStock via Getty Images

Be honest: You’ve watched a YouTube video or two in an attempt to learn how to play a song on the guitar. Whether it was through tabs or simply copying whatever you saw on the screen, the fun always ends when friends start throwing out requests for songs you have no idea how to play. So how about you actually learn how to play guitar for real this time?

It’s now possible to learn guitar from home with the Ultimate Beginner to Expert Guitar Lessons Bundle, which is currently on sale for $29. Grab that Gibson, Fender, or whatever you have handy, and learn to strum rhythms from scratch.

The strumming course will teach you how to count beats and rests to turn your hands and fingers into the perfect accompaniment for your own voice or other musicians. Then, you can take things a step further and learn advanced jamming and soloing to riff anytime, anywhere. This course will teach you to improvise across various chords and progressions so you can jump into any jam with something original. You’ll also have the chance to dive deep into the major guitar genres of bluegrass, blues, and jazz. Lessons in jam etiquette, genre history, and how to read music will separate you from a novice player.

This bundle also includes courses in ear training so you can properly identify any relative note, interval, or pitch. That way, you can play along with any song when it comes on, or even understand how to modify it into the key you’d prefer. And when the time comes to perform, be prepared with skilled hammer-ons, pull-offs, slides, bends, trills, vibrato, and fret-tapping. Not only will you learn the basic foundations of guitar, you’ll ultimately be able to develop your own style with the help of these lessons.

The Ultimate Beginner to Expert Guitar Lessons Bundle is discounted for a limited time. Act on this $29 offer now to work on those fingertip calluses and play like a pro.

 

The Ultimate Beginner to Expert Guitar Lessons Bundle - $29

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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]