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1.
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Chop yams into bite-sized cubes.
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Bring a large pot of water to a boil and add the yams.
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Boil the yams until fork tender, about 15-20 minutes.
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Drain off the water.
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Pull out the listed amount for use in the dough and season the rest with salt and pepper then set aside to use as filling (or use a different filling if you prefer).
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2.
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In a large bowl, whisk together flour mixture, tapioca flour, salt and xanthan gum (if using).
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Add mashed potato/yam and combine.
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Add egg, sour cream and olive oil and mix together until it comes together as a ball.
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3.
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Roll out the dough on a non-stick surface (baking mat, parchment paper) using a bit of tapioca flour so your rolling pin doesnt stick.
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It should be about 1/4 inch thick or so.
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See related blog link for step-by-step photos.
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Cut out rounds of dough using a biscuit cutter and gather scraps.
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Re-roll scraps and cut out additional rounds.
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4.
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Put about a tablespoon of your filling into the middle of your round.
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Brush some egg white around one half of your round and fold dough in half around the filling.
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Pinch seams together.
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Repeat for all the rounds.
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5.
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Bring a large pot of water to boil.
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Add about 7-8 pierogi to the boiling water at a time, and boil about 3-4 minutes.
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They are done when they float.
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Remove them from the water with a kitchen spider or slotted spoon.
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Repeat boiling the rest.
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6.
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Saute the boiled pierogi in butter for a minute or two per side to crisp them up, if desired.
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These are great served with onion fried in butter and a little sour cream.
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Notes: 1.
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Check the related blog link for the flour mix I use if you dont have one already.
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2.
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At the end of step 4, you can flash freeze them if you like.
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When youre ready to eat, just continue with step 5 but boil the frozen pierogi for about 5 minutes, or until they float.