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1
Cut butter into 1/2-inch cubes, then set aside in the freezer to keep cold. Meanwhile, prepare the rest of the ingredients.
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2
Weigh the flour and set aside in the freezer or fridge as well. The colder the ingredients, the better.
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3
Grind walnuts very finely with a mouli grater (I couldn't find walnut meal). Don't use a food processor-the chopped pieces will still come out too big. Alternatively, use almond meal, which is also commonly used for baking Vanillekipferl in Austria.
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4
Put flour and butter in a food processor and pulse a couple of times until the mixture resembles coarse crumbs. If you use a small food processor, you can do it in two batches. By hand: Use a pastry cutter or rub the cold butter cubes and flour between your fingers until it resembles coarse meal.
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5
In a mixing bowl, mix egg yolks together with vanilla and milk, just until combined.
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6
Add butter-flour crumbs, walnuts, sugar, and salt to the egg mixture and stir until the ingredients come together as a dough.
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7
In the bowl, knead the dough with your hands until well combined, for about 30 seconds.
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8
Cut the dough into quarters, keep one on the counter, and set the rest of the dough aside in the fridge. Cover the bowl of dough so the dough won't get dry.
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9
Divide the dough into egg-sized pieces and roll out each of them with your hand into strands about 1/2-inch in diameter.
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10
Cut the strands into 2-inch long pieces. Use your hands to roll out every piece to about 3 to 3 1/2 inches long and shape into crescents. Make the ends slightly thinner, but not too thin, as they will brown first.
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11
Arrange the shaped crescents on a baking sheet lined with parchment paper (makes the handling a lot easier), at least 1/2-inch apart from each other.
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12
Bake the cookies in the center rack of the oven (I use rack 3 of 4 from bottom) in a 350u00b0 F preheated oven for 13 to 15 minutes or until lightly colored. Don't let them color too much.
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13
To make the sugar coating: Mix sifted confectioner's sugar and granulated or vanilla sugar until well combined. If using homemade vanilla sugar, mix most of it with the sifted powdered sugar, keeping a tiny amount aside in case you need more confectioner's sugar for the coating.
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14
Put the coating on a plate and prepare an empty plate for the finished Vanillekipferl. Meanwhile you can start rolling out the next batch.
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15
Take out the baking sheet from the oven, removing the cookies immediately, so they don't continue baking. If you are using parchment paper, you can carefully remove the cookies along with the parchment paper. If not, remove them with a spatula and set them aside. Be careful, as they break easily when they are hot.
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16
Let them cool for 1 minute, then put several crescents in the prepared sugar-vanilla mixture, roll them around until covered in sugar and transfer to a plate. Be careful not to break them-because then you have to eat them immediately ;-). The sugar will stick best when the cookies are still warm while you're rolling them. Also, don't touch them for too long on the same spot as this will yield in Vanillekipferl with fingerprints. If you did so, you can always sprinkle them with additional sugar when finished or before serving.
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17
Now roll out your next batch of dough, but don't put the dough crescents on a warm baking sheet. I always arrange them onto a sheet of parchment paper with a big cutting board underneath and transfer the paper onto the sheet just before baking. Or you use 2 or 3 separate sheets for baking them, especially if you have some helpers (recommended!). Repeat with each batch of dough.
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18
When completely cool, store crescents in an airtight container or cookie box.
