How to Make a Homemade Pie Crust, According to Science

iStock/bhofack2
iStock/bhofack2

If you've ever flipped through a cookbook, you could be forgiven for thinking that making a homemade pie crust looks easy. After all, the recipe calls for just three ingredients: flour, water, and fat (and a pinch of salt for flavor). What could go wrong?

Well, everything. Make one mistake, and your homemade pie crust could turn into a leathery, brittle, gummy, crumbly, tough, or—worst of all—soggy mess. And that’s because science is standing in the way of that flaky fulfillment.

Homemade Pie Crust: The Basics

Let’s start at the top of the recipe. Most cookbooks recommend “cutting in” (or incorporating) the fat into the flour until the mix resembles a coarsely ground meal. Then, you add cold water in small increments.

The reason? Gluten.

Gluten is a protein formed when two other protein molecules called glutenin and gliadin, found in wheat, interact with water. The more you mix or knead water into dry flour, the more cross-linked bonds between the molecules (and the more gluten) you’ll create, giving the dough strength and structure. Homemade pie crust, however, is delicate. Too little gluten, and your crust won't be strong enough to hold itself together. Too much gluten, and your crust will become tough and chewy [PDF].

And that’s why cutting in the fat properly is so important. If you under-mix the fat, the flour will be too powdery and might require extra water to create a malleable, workable dough. Each extra drop will increase the risk that you'll form too much gluten. On the other hand, if you over-cut the fat, you won’t have enough dry flour available to take in water at all. In that case, you won’t make enough gluten, and your piecrust will crumble.

Chill the Fat

Pie crust recipes universally agree that the fat must be well chilled. That's because, if the fat melts prematurely during mixing, you could introduce unwanted moisture to the flour—thus promoting the overproduction of gluten. (This is especially true if you're using butter, which is 15 percent water. It's less worrisome if you're baking with lard and shortening, which contain little—if any—water at all.)

Gluten-control aside, there's another reason to keep fat chilled. When you eventually roll the crust, layers of cold fat will be flattened and stretched throughout the dough. When this fat finally melts in the oven, it will leave behind air pockets that will expand as water in the dough evaporates. This sudden phase change is the secret to flaky crust—and it'll never occur if your fat melts too early.

While bakers like to bicker over what fat is best, we'll leave that up to you. Butter is praised for its taste. Shortening is praised for its consistency. Whatever you choose, work fast—butter melts around 95℉, lard around 110℉, and shortening at 117℉ [PDF]. And keep in mind that while it's easiest to cut in cold fats with your hands, it’s also the easiest way to accidentally warm the fat. Work quickly!

To ensure that fat stays cold until baking time comes, some bakers recommend refrigerating the rolling pin. Others go so far as to recommend rolling the dough with a chilled bottle of wine. (Frankly, we like this second idea because, after all, you can’t drink a rolling pin while waiting for a pie to bake.)

Pick the Proper Pan

Even if you cut in fat at the ideal consistency and the right temperature, you could still end up with a dreaded soggy bottom. To avoid a flabby pie, the bottom crust must harden before the wet filling above has a chance to seep in—and that means you need heat. We’ll let the folks at Cook’s Illustrated explain:

“In its raw state, pie dough is made up of cold, solid fat distributed among layers of moist flour. These layers are easily permeated by juices from the ... filling, which stay in the dough for the duration of  baking, producing a soggy crust. The key to protecting the dough is to partially liquefy the solid fat as quickly as possible so that it can better fill and coat the spaces among the particles of flour, creating a watertight barrier and preventing the juices from soaking in.”

The quicker the pastry heats, the less likely that juices from your filling will leech into the bottom crust. So when picking a pie tin, consider what conducts heat the quickest: Thick metal pans will heat faster than glass, and glass will generally heat faster than stoneware. (That’s not to say glass or stoneware are bad choices. Glass heats slowly but it will stay intensely hot for longer durations and, as a result, may actually bake something faster. And ceramic is generally agreed as the prettiest for serving, though people have different opinions on it for baking. But if you use either, you many want to place them in the hottest part of the oven for the first few minutes. Better yet, lay them on a pizza stone.)

There are plenty of other techniques to cook the bottom quickly. Some experts recommend placing the pie tin on a preheated baking sheet that has spent 15 minutes in a 400℉ oven. Others swear by using dark, metal tins. (According to the BBC, “black tins will absorb more heat than light-colored shiny tins, which reflect heat.”) You can also coat the pie’s bottom in an egg wash before adding any filling. Heat will cause the egg proteins to thicken and bind, creating an extra barrier between the crust and filling.

As the pie bakes, the filling will create steam within the crust, and you want to avoid trapping moisture. Cut generous slits into the pie’s top lid. Not only do these look attractive, they allow steam to escape.

Finally, the best part about making a homemade pie crust is eating the pie. Pop that bottle of wine/rolling pin and get slicing.

20 Attempts to Describe the Taste of Durian, the World’s Smelliest Fruit

iStock.com/Worradirek
iStock.com/Worradirek

The durian is a beloved delicacy in Malaysia, Singapore, and other parts of Southeast Asia. Its taste and smell, however, take some getting used to. The creamy fruit is notoriously potent—in fact, it’s so smelly that Singapore’s public transit systems tell passengers not to bring them onto subways or buses. And yet, despite its stinky reputation, it can be found practically everywhere: In curries, cakes, and even ice cream. For visitors, biting into the fruit can be an utterly confusing and contradictory experience. Here are some outsider opinions from the past 400 years.

1. “The flesh is as white as snow, exceeds in delicacy of taste of all our best European fruits, and none of ours can approach it.” —Jacques de Bourges, 17th Century Missionary

2. “Comparisons have been made with the civet cat, sewage, stale vomit, onions, and cheese; while one disaffected visitor to Indonesia declared that the eating of the flesh was not much different from having to consume used surgical swabs.” —The Oxford Companion to Food

3. “Tastes lightly sweet and deeply musky.” —Frommer’s Guide to Malaysia

4. “[I]ts odor is best described as pig-sh*t, turpentine and onions, garnished with a gym sock. It can be smelled from yards away.” —Richard Sterling, food writer

5. "To eat it seems to be the sacrifice of self-respect.” —Bayard Taylor, 19th-century Journalist

6. “To anyone who doesn’t like durian it smells like a bunch of dead cats. But as you get to appreciate durian, the smell is not offensive at all. It’s attractive. It makes you drool like a mastiff.” —Bob Halliday, Bangkok-based food writer

7. “Vomit-flavoured custard.” —The Rough Guide to Malaysia, Singapore & Brunei

8. “The smell of rotten eggs is so overwhelming. I suppress a gag reaction as I take a bite.” —Robb Walsh, food writer

9. “Like all the good things in Nature … durian is indescribable. It is meat and drink and an unrivalled delicacy besides, and you may gorge to repletion and never have cause for penitence. It is the one case where Nature has tried her hand at the culinary art and beaten all the CORDON BLEUE out of heaven and earth.” —a "good friend" of Edmund J. Banfield, Australian Naturalist, as quoted in Banfield's 1911 book My Tropic Isle

10. “[Has a] sewer-gas overtone.” —Maxine E. McBrinn, Anthropologist

11. “Like pungent, runny French cheese … Your breath will smell as if you’d been French kissing your dead grandmother.” —Anthony Bourdain, Chef and Host of Parts Unknown

12. “On first tasting it, I thought it like the flesh of some animal in a state of putrefaction, but after four or five trials I found the aroma exquisite.” —Henri Mouhot, French Naturalist, in Travels in the Central Parts of Indo-China: Siam, Cambodia, and Laos, During the Years 1858, 1859, and 1860

13. “[Like] eating ice cream in an outhouse.” —As reported in Jerry Hopkins's Strange Foods

14. “I must say that I have never tasted anything more delicious. But not everyone can enjoy or appreciate this strange fruit for the disgusting smell that distinguishes it and that is apt to cause nausea to a weak stomach. Imagine to have under your nose a heap of rotten onion and you will still have but a faint idea of the insupportable odour which emanates from these trees and when its fruit is opened the offensive smell becomes even stronger.” —Giovanni Battista Cerruti, Italian Explorer, in 1908's My Friends the Savages

15. “It tastes like completely rotten mushy onions.” —Andrew Zimmern, Host of Bizarre Foods

16. “Like eating raspberry blancmange in the lavatory.” —Anthony Burgess, Novelist

17. “A rich custard highly flavored with almonds gives the best general idea of it, but there are occasional wafts of flavor that call to mind cream-cheese, onion-sauce, sherry-wine, and other incongruous dishes." —Alfred Russel Wallace, 19th-century British Naturalist

18. “You will either be overcome, seduced by its powerful, declarative presence, or reject it outright. And run screaming." —Monica Tan, The Guardian Journalist

19. “Carrion in custard.” —A “Governor of the Straits” quoted in 1903's Hobson-Jobson: A glossary of colloquial Anglo-Indian words and phrases, and of kindred terms, etymological, historical, geographical and discursive

20. “Yes, I freely admit that when ripe it can smell like a dead animal. Yes, the fruit is difficult to handle, bearing likeness to a medieval weapon. But get down to the pale yellow, creamy flesh, and you’ll experience overtones of hazelnut, apricot, caramelized banana and egg custard. That’s my attempt at describing durian. But words fail; there is no other fruit like it.” —Thomas Fuller, New York Times Journalist

What Is Nougat?

iStock.com/InaTs
iStock.com/InaTs

If you've ever had a Snickers, Three Musketeers, or Milky Way bar, you know what nougat tastes like. The sweet, creamy concoction can range in texture from chewy to fluffy, and it is the star ingredient in many popular candy bars. But aside from being delicious, what is nougat exactly?

In its simplest form, nougat is made of two basic ingredients: egg whites and a sweetener, traditionally sugar or honey. The signature texture comes from how it's prepared. Like a meringue, eggs and sugar are whipped together quickly until the mixture is aerated and stiff.

Nougat predates mass-produced candy bars, with the confection originating in the Middle East around the 8th century. It spread to southern Europe and gained widespread popularity in 17th-century France. Nougat is still a common component in many Middle Eastern desserts today, and torrone, a type of nougat containing nuts like almonds and pistachios, is enjoyed in Italy around Christmastime.

As more large candy companies have embraced nougat, its quality has suffered over the years, with corn syrup often standing in for the sweetener. But you don't need to head to the candy aisle of your local supermarket to get your nougat fix. If you have eggs and honey in your kitchen, you can make nougat at home today.

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