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.

The Most Popular Christmas Cookie in Each State

Jen Tepp/iStock via Getty Images
Jen Tepp/iStock via Getty Images

While opinions about peppermint bark, reindeer corn, and other Christmas candies are important enough to warrant a map of their own, we all know that the real crown jewel of any kitchen counter during the holidays is an enormous platter of homemade cookies.

In a festive endeavor to guess which type of cookie is most likely to be on your counter this Christmas, General Mills collected search data from BettyCrocker.com, Pillsbury.com, and Tablespoon.com, and created a map that shows which recipes are clicked most often in each state.

Those universally adored Hershey Kiss-topped peanut butter cookies, known on Betty Crocker’s website as Classic Peanut Butter Blossoms, took the top spot in seven states, including Florida, Pennsylvania, California, Kentucky, Nevada, South Carolina, and Wyoming. And people don’t just love peanut butter in blossom form—Easy Peanut Butter Cookie Cups, Peanut Butter-Chocolate Cookies, and 2-Ingredient PB-Chocolate Truffles also made appearances on the list.

general mills christmas cookies map
General Mills

Peanut butter treats are definitely a popular choice among holiday bakers in general, and cookie decorators are likely responsible for the prevalence of plain old sugar cookies across the nation. Sugar Cookie Cutouts, Easy Spritz Cookies, and Easy Italian Christmas Cookies all offer a deliciously blank slate for your artistic aspirations.

Apart from peanut butter- and plain sugar-based desserts, the rest of the results were pretty scattered. Iowa most often opts for the figure eight-shaped Swedish Kringla, while Michigan loves a good jam-filled Polish Kolaczki. Surprisingly, Hawaii was the only state to choose gingerbread cookies as their seasonal favorite.

If you’re thinking classic chocolate chip cookies are suspiciously absent from this map altogether, you have great dessert-related detective skills: General Mills decided to omit them from the study, since they’re Betty Crocker’s most-searched cookie recipe all year long, and they would’ve dominated in a staggering 22 states.

Whether you’re looking for a new show-stopping cookie recipe or just wondering how your long-standing family traditions compare to others’, you can read more on the study—and see all the recipes in full—here.

[h/t General Mills]

Why Do Fruitcakes Last So Long?

iStock
iStock

Fruitcake is a shelf-stable food unlike any other. One Ohio family has kept the same fruitcake uneaten (except for periodic taste tests) since it was baked in 1878. In Antarctica, a century-old fruitcake discovered in artifacts left by explorer Robert Falcon Scott’s 1910 expedition remains “almost edible,” according to the researchers who found it. So what is it that makes fruitcake so freakishly hardy?

It comes down to the ingredients. Fruitcake is notoriously dense. Unlike almost any other cake, it’s packed chock-full of already-preserved foods, like dried and candied nuts and fruit. All those dry ingredients don’t give microorganisms enough moisture to reproduce, as Ben Chapman, a food safety specialist at North Carolina State University, explained in 2014. That keeps bacteria from developing on the cake.

Oh, and the booze helps. A good fruitcake involves plenty of alcohol to help it stay shelf-stable for years on end. Immediately after a fruitcake cools, most bakers will wrap it in a cheesecloth soaked in liquor and store it in an airtight container. This keeps mold and yeast from developing on the surface. It also keeps the cake deliciously moist.

In fact, fruitcakes aren’t just capable of surviving unspoiled for months on end; some people contend they’re better that way. Fruitcake fans swear by the aging process, letting their cakes sit for months or even years at a stretch. Like what happens to a wine with age, this allows the tannins in the fruit to mellow, according to the Wisconsin bakery Swiss Colony, which has been selling fruitcakes since the 1960s. As it ages, it becomes even more flavorful, bringing out complex notes that a young fruitcake (or wine) lacks.

If you want your fruitcake to age gracefully, you’ll have to give it a little more hooch every once in a while. If you’re keeping it on the counter in advance of a holiday feast a few weeks away, the King Arthur Flour Company recommends unwrapping it and brushing it with whatever alcohol you’ve chosen (brandy and rum are popular choices) every few days. This is called “feeding” the cake, and should happen every week or so.

The aging process is built into our traditions around fruitcakes. In Great Britain, one wedding tradition calls for the bride and groom to save the top tier of a three-tier fruitcake to eat until the christening of the couple’s first child—presumably at least a year later, if not more.

Though true fruitcake aficionados argue over exactly how long you should be marinating your fruitcake in the fridge, The Spruce says that “it's generally recommended that soaked fruitcake should be consumed within two years.” Which isn't to say that the cake couldn’t last longer, as our century-old Antarctic fruitcake proves. Honestly, it would probably taste OK if you let it sit in brandy for a few days.

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