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STEP BY STEP DIRECTIONS
FOR THE DOUGH
1. Preheat the oven to 200C/390F and prepare a 23cm/9-inch springform pan by lining the bottom with parchment paper and greasing the sides with cooking oil or butter.
2. Combine water, milk, unsalted butter, sugar, salt, and vanilla extract in a medium saucepan, then heat over medium heat until it starts simmering.
3. Remove from the heat and add the flour. Mix until no dry flour is left and bring back to the heat. Set it to low.
4. Cook for 2 minutes until the dough forms a ball and leaves a pale residue on the bottom of the saucepan.
5. Place the dough into a mixing bowl or a stand mixer fitted with a paddle attachment and let it cool down for 10 minutes. Then, add one egg and mix until fully incorporated. Repeat with the rest of the eggs.
6. Split the dough between two spring forms and spread it unevenly.
7. Bake for 25-30 minutes, or until reaching a deep golden-brown color on top. Cool down on the cooling rack completely before assembling our Polish cake.
FOR THE FILLING
1. Place milk, half of the sugar, and salt into a saucepan and heat over medium heat until simmering.
2. Combine the second half of the sugar with cornstarch in a mixing bowl. Add the egg yolks and vanilla. Whisk until a homogenous consistency is reached without lumps.
3. Add approximately ½ of the hot milk to the egg yolk mixture while whisking vigorously to temper the eggs. Then, pour the egg mixture back into a saucepan with the rest of the hot milk.
4. Return to the heat. Cook over low heat for 5-7 minutes, whisking consistently until the mixture becomes pudding-like in consistency (this is so-called pastry cream or custard cream), then cook for 2 minutes. If lumps appear, whisk vigorously and they will dissolve.
5. Remove from the heat and pour the mixture into a large, shallow dish. Cover the pastry cream with plastic wrap so they touch each other, then leave it to cool down to room temperature.
6. In a stand mixer fitted with a whisk attachment (or use a hand mixer and a large mixing bowl), beat the butter with 15g of sugar until white and fluffy.
7. Whisk the pastry cream with a whisk until smooth again.
8. Add the pastry cream a couple of tablespoons at a time to the butter and whisk every time on medium until incorporated. Continue until all pastry cream is combined with the butter. Scrape the sides and the bottom of the bowl, then beat again for 10 seconds. Here you have your mousseline cream for Carpathian cream cake.
9. Assemble your Karpatka cake and chill. Then, dust with powdered sugar and serve.
FAQ
It will last for up to 3 days. Also, you can make the choux pastry in advance and keep it in the fridge for 2-3 days, then bake.
You can freeze baked cake layers for up to 1 month but you can’t freeze the cream. It’s also not recommended to freeze unbaked choux pastry.
Equipment
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Rubber spatula
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Stand mixer
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Digital kitchen scale
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23cm/9-inch springform pan