The onions go on before anything else in my kitchen, and they stay on the back burner for the better part of an hour.
Three yellow ones, sliced thin, butter, salt, low heat.
By the time the dough has rested, they've gone from pale and squeaky to a soft brown tangle.
That patience is the difference between this dish and a plate of dumplings with onions on top.
I learned pierogi from a friend's mother in Cleveland who worked with her hands and answered questions with corrections.
She caught me pinching one edge once and pressing it flat.
Her word for that was "lazy," and she was right, because it burst in the water thirty seconds later.
A pierogi is a filled half moon with a firm crimped seal, boiled until it floats and then fried in butter until one face blisters golden.
Not a ravioli, which is thin pasta cut into squares, and not a plain steamed dumpling.
The dough here is soft and slightly thick, enriched with an egg yolk and sour cream the way a Polish kitchen actually does it.
Sweet potato makes a rounder filling than the usual potato and cheese, and the onions keep it savory.
Set aside an afternoon, make a double batch, and freeze half.
You'll be glad you did in February.
What Makes a Pierogi a Pierogi
Three things, and if you skip any of them you have made something else.
- The shape. A half moon, cut from a round of rolled dough, folded over the filling and sealed along the curve. Not a square, not a pouch gathered at the top.
- The dough. Soft, elastic, and rolled a little thicker than pasta, about ⅛ inch. It should be tender and slightly chewy, never papery. Wonton wrappers give you something closer to ravioli.
- The two step cook. Boiled first until they float, then pan fried in butter. The boil cooks the dough through and sets the seal, and the fry gives you the blistered golden face and the crisp edges.
That two step method is what people are really after when they order pierogi.
Boiled alone, they're soft and a little pale. Fried alone, the dough stays raw in the middle.
Both, in order, and you get tender and crisp in the same bite.
Ingredients
For the Dough
- All purpose flour (3 cups). Plain flour is correct here. Bread flour makes the dough tough and springy.
- Salt (1 teaspoon).
- Egg yolk (1 large). Richness and color, and it makes the dough easier to handle.
- Sour cream (¼ cup). The traditional tenderizer. Its acid keeps the dough soft and stops it snapping back when you roll it.
- Warm water (¾ cup). Warm, not hot. Add it gradually since flour varies.
- Melted butter (2 tablespoons).
For the Filling
- Sweet potatoes (2 medium, roasted and mashed, about 2 cups). Roasted. Boiling waterlogs them and a wet filling is the number one cause of a burst pierogi.
- Farmer cheese or cream cheese (4 ounces). Farmer cheese is the authentic choice and cream cheese is easier to find. Either one adds a savory tang and firms the filling up.
- Onion (½ small, finely chopped and softened in butter). Separate from the caramelized onions on top.
- Fresh sage (½ teaspoon, chopped). Earthy, and it suits sweet potato better than almost anything.
- Fresh thyme (¼ teaspoon, chopped).
- Salt (½ teaspoon), black pepper, and a pinch of nutmeg. The nutmeg is barely detectable and you'd miss it if it were gone.
For the Caramelized Onions
- Unsalted butter (3 tablespoons).
- Yellow onions (3 large, thinly sliced). Yellow. More on that below.
- Salt (½ teaspoon).
To Finish
- Butter (3 tablespoons). For frying the boiled pierogi.
- Sour cream and coarse black pepper. At the table.
Ingredient Notes
Why an egg yolk and sour cream. Every top recipe I found for sweet potato pierogi is vegan, which means flour, water, and oil. That dough works, but it's noticeably firmer and it dries out faster. The yolk and sour cream give you a dough that stays supple and tastes like something.
Roasted, not boiled. Roast the sweet potatoes whole at 400°F for 50 minutes, then scoop out the flesh. Sweet potato holds far more water than a russet does, and boiling adds even more.
Wonton wrappers. They're a real shortcut and I won't pretend otherwise. The tradeoff is honest though: they're thinner, they tear more easily, and the result eats like a ravioli. Worth it on a Tuesday, not worth it if you want the real thing.
How to Caramelize Onions for Pierogi
Give them 30 to 40 minutes and do not try to shorten it. There's no version of this that works in ten.
Yellow onions are the right choice. They have enough sugar to brown properly and enough sharpness to stay interesting. White onions are milder and go flat. Red onions turn a murky grey brown that looks wrong on the plate.
Slice them thin and even, root to tip.
Melt the butter in a wide skillet over medium-low heat, add the onions and the salt, and stir to coat.
The salt early draws water out and speeds up the first stage.
Then leave them mostly alone, stirring every 5 minutes or so and scraping the brown film off the bottom of the pan each time.
They'll go clear, then pale gold at around 20 minutes, then a proper deep amber somewhere between 30 and 40.
If the pan looks dry or the film starts to darken too fast, add a splash of water and scrape.
Fair warning: they shrink to about a quarter of their starting volume, so three large onions makes a modest bowlful.
How to Make Sweet Potato Pierogi
Start the onions, then make the dough, then the filling. The timing works out on its own.
Step 1: Make and Rest the Dough
Whisk the flour and salt in a bowl.
Add the egg yolk, sour cream, melted butter, and most of the warm water, and mix until it comes together into a shaggy mass.
Knead on the counter for 6 to 8 minutes until smooth and springy, adding the last of the water only if it feels dry.
Cover with a bowl and rest for 30 minutes. Skipping the rest means dough that fights you at every roll.
Step 2: Make the Filling
Roast, scoop, and mash the sweet potato, then let it cool completely.
Warm is fine for eating and terrible for filling, because heat softens the dough and steam opens the seal.
Stir in the cheese, the softened chopped onion, sage, thyme, salt, pepper, and nutmeg.
The filling should be thick enough to scoop and hold a shape on a spoon.
Step 3: Roll and Cut
Roll half the dough at a time to about ⅛ inch thick, keeping the rest covered.
Cut rounds with a 3 inch cutter or a drinking glass.
Re-roll the scraps once. Twice and they get tough.
Step 4: Fill and Seal
Put 1 rounded teaspoon of filling slightly off center on each round.
Fold over into a half moon and press the edges together firmly, working from the middle out to each corner so air escapes as you go.
Go back and pinch the whole seam a second time.
Step 5: Boil
Bring a wide pot of salted water to a gentle boil, not a rolling one, since a violent boil knocks them apart.
Drop in 8 to 10 at a time.
They sink, then float after 2 to 3 minutes. Give them 1 more minute after they surface, then lift them out with a slotted spoon onto an oiled tray.
Step 6: Fry in Butter
Melt the butter in a large skillet over medium heat.
Lay the boiled pierogi in flat, in a single layer, and fry 2 to 3 minutes per side until blistered and golden.
Pile them onto plates and bury them under the caramelized onions.
Sealing Them So They Do Not Burst
- Keep the rim dry. This is counterintuitive since so many dumpling recipes tell you to wet the edge. Pierogi dough is soft enough to bond to itself, and water makes the seam slip apart under your fingers.
- Do not overfill. One rounded teaspoon in a 3 inch round. An overfilled pierogi has no clean dough left to grip.
- Press from the center outward. Trapped air expands in the boiling water and pops the seam.
- Pinch twice. Once to close, once to commit. Run a fork around the edge afterward if you like the ridged look.
- Cool filling only. A warm filling steams inside the dough and softens the seal from within.
- Gentle boil. Big rolling bubbles are rough enough to tear a seam that was almost good enough.
Recipe Tips
- Work in batches and keep everything covered. Dough rounds dry out in minutes and dry edges will not seal.
- Set up a line. Rounds on the left, filling in the middle, finished pierogi on a floured tray. Filling them one at a time from scratch takes twice as long.
- Do not stack the boiled ones. They stick together instantly. Oil the tray and lay them out flat.
- Fry only what you'll eat now. Boiled pierogi keep well. Fried ones go soft within the hour.
How to Serve
Onions on top, sour cream on the side, coarse black pepper over everything.
That's the classic plate and it hasn't been improved on.
Six pierogi make a generous main, four make a starter.
A sharp green salad with a vinegar dressing is a good idea alongside, because the plate is rich and the acid cuts it.
Worth making a double batch? Every single time.
Make Ahead, Storage and Freezing
- Freezing raw. This is the best method by a distance. Lay the filled pierogi on a floured tray, freeze until solid (about 2 hours), then bag them. They keep 3 months.
- Cooking from frozen. Straight into gently boiling water, no thawing, and add 2 minutes to the boil time. Thawed raw pierogi are limp and they stick.
- Cooked leftovers. Refrigerate up to 3 days and reheat in butter in a skillet.
- The onions. They keep 5 days in the fridge and I make them in advance on purpose.
- The dough. Wrapped tightly, it holds in the fridge overnight. Let it come back to room temperature before rolling.
Recipe
Sweet Potato Pierogi with Caramelized Onions
Ingredients
For the Dough
- 3 cups all purpose flour
- 1 teaspoon salt
- 1 large egg yolk
- ¼ cup sour cream
- ¾ cup warm water added gradually
- 2 tablespoons butter melted
For the Filling
- 2 medium sweet potatoes roasted and mashed, about 2 cups, cooled completely
- 4 ounces farmer cheese or cream cheese
- ½ small onion finely chopped and softened in butter
- ½ teaspoon fresh sage chopped
- ¼ teaspoon fresh thyme chopped
- ½ teaspoon salt
- ¼ teaspoon black pepper
- 1 pinch ground nutmeg
For the Caramelized Onions
- 3 tablespoons unsalted butter
- 3 large yellow onions thinly sliced
- ½ teaspoon salt
To Finish
- 3 tablespoons butter for frying
- ½ cup sour cream to serve
- ½ teaspoon coarse black pepper to serve
Instructions
Caramelize the Onions
- Melt 3 tablespoons of butter in a wide skillet over medium-low heat. Add the sliced yellow onions and the salt and stir to coat.
- Cook 30 to 40 minutes, stirring every 5 minutes and scraping the brown film off the pan bottom, until deep amber. Add a splash of water if the pan runs dry.
Dough and Filling
- Whisk the flour and salt. Add the egg yolk, sour cream, melted butter, and most of the warm water, and mix to a shaggy mass.
- Knead 6 to 8 minutes until smooth and springy, adding the last of the water only if it feels dry. Cover and rest 30 minutes.
- Roast the sweet potatoes at 400F for 50 minutes, scoop the flesh, mash, and cool completely.
- Stir the cheese, softened chopped onion, sage, thyme, salt, pepper, and nutmeg into the cooled mash. It should hold its shape on a spoon.
Fill and Cook
- Roll half the dough at a time to ⅛ inch thick and cut 3 inch rounds, keeping the rest covered.
- Place 1 rounded teaspoon of filling slightly off center on each round. Fold into a half moon and press the dry edges together from the center outward, then pinch the whole seam a second time.
- Bring a wide pot of salted water to a gentle boil. Cook 8 to 10 pierogi at a time. They float after 2 to 3 minutes. Give them 1 more minute, then lift them onto an oiled tray.
- Melt 3 tablespoons of butter in a large skillet over medium heat and fry the boiled pierogi in a single layer, 2 to 3 minutes per side, until blistered and golden.
- Plate the pierogi and cover them with the caramelized onions. Serve with sour cream and coarse black pepper.
Notes
- Keep the rim dry: pierogi dough bonds to itself. Water makes the seam slip and burst.
- Cool filling only: a warm filling steams inside the dough and opens the seal.
- Gentle boil: a rolling boil tears seams. Keep the water just moving.
- Freeze raw: freeze filled pierogi solid on a floured tray, then bag. Boil from frozen and add 2 minutes.
- Yellow onions only: white go flat and red turn a murky grey brown.
