This post may be a
little lengthy but if you like flaky crust, bear with me...
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Pie Crust: The
Science...
Like all baking, it is a
science based on specific formulas. If the formula is out of balance, the
results will be inconsistent.
Three Basic Categories
of Ingredients:
Pie crust is based off
three basic categories of ingredients. Within each category there are multiple
choices to choose. It depends on the desired outcome and use of pie crust.
1. Flour - The Beginning Place for Flaky Crusts.
Recommended: All-Purpose
Flour/Pastry Flour
Yeasted bread has a
texture that is created by the formation of gluten, comprised of two proteins
that when mixed with water creates a stretchy elastic network that is very
dense. The density of the gluten structure is necessary for the gasses of the
yeast to be trapped to create a light and airy texture.
While this may be
desired for bread, it is the exact opposite with cakes, muffins, &
pastries; and pie crust is no exception to this rule. This is because we want a
tender outcome that is less bread-like and pleasant contrast on the tongue.
To achieve this, select
flour that has less protein. All-purpose flour or pastry flour works best for
pie crusts. Stay away from bread flour, or high-gluten flour.
If you would like more
information how flour works in baking, here is a link to an article on the
subject: http://www.smacznegoablog.com/2011/03/flour-difference.html
2. Fat - The Most Important Ingredient!
There are multiple
choices to use for pie crust. Recipes vary from oil, sour cream, cream cheese,
lard, butter, and even goat cheese. But what to choose from?
The flaky texture in pie
crust comes from a very low moisture content in the crust. Also, by selecting a
fat tha has a lower moisture content will also give you more control over the
dough to prevent overworking.
Based on this
information either Shortening or Lard has virtually a 0% moisture content and will
provide the flakiest crust on the planet! But does this make it the best
choice? Not necessarily....
Shortening: has a significantly higher melting point than
the other fats; between 117 degrees & 119 degrees Fahrenheit to be exact.
Why is this important? Because our body temperature is 98.6 degrees Fahrenheit.
This means that the shortening will not start melting in your mouth creating a
crisp, but a lack of taste & texture (something we call in culinary, an "unpleasant mouthfeel")
Butter: Butter on the other hand has a melting point of
90 - 95 degrees Fahrenheit (depending on type & grade). This means it will
begin to melt in your mouth when you begin to eat it. However, this creates a
problem all in itself. All butter crusts sometimes seem to have a pasty
consistency because of the 7-10% moisture content contained within the butter.
(Yes, 7-10% is enough to create a difference between flaky & pasty.)
The solution? Use a mixture of Shortening & Butter. The
BEST ratio: Substitute 16% of the Shortening with butter. By mixing the two ingredients, the moisture in
the little bit of butter will evaporate in the oven. The shortening will create
the flakiness while the butter will begin to melt in your mouth creating the
perfect eating experience.
3. Moisture: Moisture can be really anything liquid. I've
seen recipes call for vodka, apple jack, club soda, and wine. For me, I use old
fashioned ice water. Seems to work best for me.
Use about 1/4 cup per 2
cups of flour in the recipe. The amount of water is going to vary slightly each
time you make crust. Use just enough to gather the dough together.
Rather
than mix, toss the water into the flour to prevent the formation of gluten. The
more you mix, the more gluten develops which is not desired for a flaky crust.
Those are the three
categories of ingredients that influence the flakiness of pie crust. I always
add a bit of salt & sugar into my crust too. But this has nothing to do
with the flakiness, just a matter of taste preference.
Two Misconceptions/Myths
of Pie Crust Making:
1. Add Vinegar to the
Water, It Makes it Flakier!
The vinegar does not
make the dough flakier. Many people add vinegar without realizing what is
really happening. Vinegar is an acid that reacts negatively to the formation of
gluten. This means that it is harder to overwork your dough. The vinegar in its
self does not create a flakier crust. If you don't overwork your crust in the
first place, there is no need to add vinegar, it will do absolutely nothing! If
you are new at making pie dough, then yes, add a teaspoon or less to the water.
2. Use a Food Processor,
it's the same thing as two knives or pastry blender.
This is completely
false. The science of the fat being "cut" into the flour is an
important concept to the flakiness of the final product. By
"cutting", you are only cutting the fat into small pieces and coating
it with flour so the water will make all the fat pieces stick together. This is
because fat & water will not mix, but when flour is coating the fat, the
water can work with the flour to create a dough of essentially fat pieces.
What a food processor
does is completely different. It forces the flour to "mix" with the
fat creating a more cookie-like consistency. The difference between
"mix" & "cut/coat" the fat with flour is significant.
It is for this reason I recommend to only use two knives or pastry blender.
TIPS FOR BETTER PIE
CRUST:
The Colder the Better: Everything should be cold when making pie dough,
especially the fat. Otherwise everything will mix rather than coat. Pop the
shortening, butter, water & flour in the freezer for a few minutes before
starting. Using a metal bowl will also help keep everything colder longer while
you make the dough. Some people even go as far as to roll the dough on a
chilled marble slab; while that may be excessive, it is pretty common in
bakeries where the temperature can reach over 100 degrees in the kitchen. This
makes the butter in the crust begin to melt and creates a sticky mess! However,
in the home kitchen is not necessary, though some will argue otherwise.
Add a Tablespoon of Sugar
to Crust: Sometimes pie crust can
have a slightly bitter taste. The bit of sugar will help neutralize this.
Salt is Recommended: 1/2 - 1 tsp is all that is needed. Especially if
you are using vinegar in your crust, salt is a necessity. Vinegar is an acid
and can create an "off" taste. Salt is alkaline and neutralizes acid
making the "off" taste completely disappear.
Chill
the Dough for 20 Minutes Before Rolling: This will relax any gluten stands that formed and make rolling
easier.
I hope this makes sense
and helps you out. Below, I've summarized the recommendations. It may sound
like a lot, but it really isn't. I've just incorporated a lot of scientific
reasons in the post. Take out the reasoning and you have a straight forward
method of pie making. There is also a sample recipe for the perfect flaky pie
dough for you to try.
Summary of
Recommendations:
INGREDIENTS:
1. Use All-Purpose Flour
or Pastry.
2. Use a Mix of
Shortening & Butter. 84% Shortening, 16% Butter.
3. 1/4 cup ice water per
2 cups of flour.
METHODS:
1. Use Two Knives or
Pastry Blender.
2. Use Cold Ingredients.
3. Toss Water with Fork
into Fat/Flour Mixture.
4.
Wrap & Chill Pie Dough for 20 Minutes before Rolling & Using.
Pie Crust RECIPE:
Makes 2 pie crusts.
2 cups All Purpose Flour
1 Tbsp. Sugar
1/2 tsp. Salt
2/3 cup Shortening,
chilled
2 oz. Butter, chilled
1/4 cup Ice Water
Sift flour, sugar, &
salt together. Cut butter and shortening into fat with two-knives or pastry
blender until resembles coarse sand. Drizzle ice water over fat/flour crumbs.
Toss with fork just until it begins to form. Gently gather the mixture together
and firmly press together to form two disks. DO NOT KNEAD, just press
together! Wrap with plastic
wrap and chill for 20 minutes. Roll out as desired.
To Make the Top Crust
Shiny & Golden Brown, as pictured, whisk one egg white with a pinch of salt and brush on
with a pastry brush before putting pie in oven.
ENJOY!
Thank you so much for this post. It may be lengthy, but it is packed with important information. I feel like I'm getting a quality baking course!
ReplyDeleteI'm grateful you posted well in advance of the upcoming holidays. It gives me plenty of time to practice!
Your pie looks GORGEOUS!!!!