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.

17 Delicious Facts About Peeps

Getty Images
Getty Images

You know whether you prefer chicks to bunnies, fresh to stale, or plain to chocolate-covered. But there’s a lot you may not know about Peeps, everyone’s favorite (non-chocolate) Easter candy.

1. It used to take 27 hours to make a Peep.

A candy Peep being made
Getty Images

That was in 1953, when Sam Born acquired the Rodda Candy Company and its line of marshmallow chicks. Back then, each chick was handmade with a pastry tube. Just Born quickly set about automating the process, so that it now takes just six minutes to make a Peep.

2. An average of 5.5 million Peeps are made every day.

Peeps candies being made
Getty Images

All of them at the Just Born factory in Bethlehem, Pennsylvania. In one year, the company makes enough peeps to circle the earth—twice!

3. Yellow chicks are the original Peep, and still the favorite.

Boxes of yellow chick Peeps
Getty Images

Yellow bunnies are the second most popular color/shape combination. Pink is the second best-selling color.

4. The recipe has stayed pretty much the same.

Cooking up a batch of Peeps
Getty Images

The recipe begins with a boiling batch of granulated sugar, liquid sugar, and corn syrup, to which gelatin and vanilla extract are later added. 

5. The equipment has also (mostly) stayed the same.

Peeps candies being made
Getty Images

Since Just Born turned Peeps-making into an automated process, the chicks have been carefully formed by a top-secret machine known as The Depositor. Created by Sam Born’s son, Bob, The Depositor could manufacture six rows of five Peeps apiece in a fraction of the time it took workers to form them by hand. And that same machine that Bob built has been keeping the Peeps flowing ever since. Until rather recently …

In 2014, the company announced that it was planning to renovate its manufacturing plant, including The Depositor. “It’s a little sad,” vice president of sales and marketing Matthew Pye told Candy Industry Magazine at the time. “Bob Born made it from scratch in 1954 and it allowed us to distribute and grow the brand nationally." 

6. The updated equipment means new Peeps innovations could be coming.

Making Peeps at the Just Born factory
Getty Images

“The investment in our marshmallow making process will allow for more efficiency, more consistency, improved quality, and additional innovation capabilities,” co-CEO Ross Born told Candy Industry magazine about the new depositor, which will be able to produce a wider variety of Peeps in all sizes. “The [old] Peeps line did one thing and one thing very well—cranking out chicks day in and day out. Five clusters, just in different colors,” Born said.

7. Peeps used to have wings.

They were clipped in 1955, two years after the first marshmallow chicks hatched, to give the candy a sleeker, more “modern” look.

8. The eyes are the final touch.

A close up of a yellow chick Peep
Getty Images

The final flourish for all of these squishy balls of sweetness is adding the eyes, which are made of carnauba—a non-toxic edible wax (that is also found in some shoe polishes and car waxes, plus many other candies).

9. Peeps may be destructible, but their eyes are not.

Making Peeps at the Just Born factory
Getty Images

In 1999, a pair of scientists at Emory University—dubbed “Peeps Investigators”—decided to test the theory that Peeps are an indestructible food. In addition to a microwave, the pair tested the candy’s vulnerability to tap water, boiling water, acetone, and sulfuric acid (they survived them all). When they upped the ante with some Phenol, the only things that didn’t disappear were the eyes. 

10. They really are everyone's favorite non-chocolate Easter candy.

For more than 20 years now, no other non-chocolate Easter candy has been able to compete with the power of Peeps. With more than 1.5 billion of them consumed each spring, Peeps have topped the list of most popular Easter treats for more than two decades.

11. There are sugar-free Peeps.

Counterintuitive, we know. But in 2007, the first line of sugar-free Peeps hit store shelves.

12. There are also chocolate-covered Peeps.

Chocolate-covered Peeps hit the market in 2010. Today there’s a full line of them for every occasion.

13. Peeps come in a variety of flavors.

Color and shape (i.e. yellow chick) are no longer the only ways to categorize a Peep. They now come in an array of flavors, including fruit punch, sour watermelon, lemon sherbet, blueberry, and pancakes and syrup.

14. Peeps lip balm is a thing.

Yep.

15. On New Year's Eve, a giant Peep is dropped in Bethlehem, Pennsylvania.


PEEPS®

The drop is done with a traditional chick that flashes different colors at midnight.

16. Believe it or not, Peeps are not Just Born's best-selling brand.

That honor belongs to Mike and Ike. (Sorry, Peepsters.)

17. They're a boon to a creativity.

Blue chick Peeps
Getty Images

All over the country, Peeps have become the preferred media for a number of highly anticipated annual art contests. (You can check out some of the coolest creations from Westminster, Maryland's PEEPshow here.)

Updated for 2019.

10 Amazing Pieces of Peeps Art

“Edgar Allan Peep” by Christian Twamley / Courtesy of the Carroll County Arts Council
“Edgar Allan Peep” by Christian Twamley / Courtesy of the Carroll County Arts Council

Some people paint, some scrapbook, and others create Game of Thrones-inspired dragon sculptures made of 5000 marshmallow Peeps. Candy art may seem like an unusual form of craftsmanship, but it’s more common than you might expect in the lead-up to Easter, when organizations around the country host Peeps art contests.

The aforementioned dragon, as well as the artworks pictured below, were all submitted to the “PEEPshow” contest—a fundraiser for the Carroll County Arts Council in Westminster, Maryland. According to event organizers, the event became the first exhibition of Peeps art when it debuted 12 years ago.

Keep scrolling to see some of the best Peeps sculptures from recent years (2017-2019), and visit the Art Council’s website to see all of this year's participants. (As of Friday afternoon, a Warhol-inspired artwork of "Marilyn Peeproe" appears to be in the lead.)

A space-themed Peeps display
“First Peeps in Space” by International Delight / Courtesy of the Carroll County Arts Council

A samurai sculpture
"Sugar Samurai" by Tristar Martial Arts / Courtesy of the Carroll County Arts Council

The rabbit from Alice in Wonderland
“I’m Late, I’m Late (for the PEEPshow)” by Vivian Davis / Courtesy of the Carroll County Arts Council

A caterpillar sculpture
“The Very Hungry Caterpeeper” by Lia Finch and M / Courtesy of the Carroll County Arts Council

A sculpture inspired by a painting
“Peep with the Pearl Earring” by Sandy Oxx / Courtesy of the Carroll County Arts Council


“Edgar Allan Peep” by Christian Twamley / Courtesy of the Carroll County Arts Council

A Belle sculpture
“Beauty and the Peep” by Candace Birger, Westminster Cake Studio / Courtesy of the Carroll County Arts Council

Fish sculpture
“The Rainbow Fish” by Jen, Justin, Connor, and Jacob Myers / Courtesy of the Carroll County Arts Council

A Gumby sculpture
“Just Gumby” by Sydney Blacksten / Courtesy of the Carroll County Arts Council

A sculpture of a monster
“Percy the Purple Peeple Eater” by the Koontz Family / Courtesy of the Carroll County Arts Council

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