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Sift the flour into the bowl of an electric mixer fitted with a hook attachment. Add the salt, 110 g – 4 oz sugar, milk powder, milk, and 53 g – 3 ¾ tablespoons soft butter.
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Dissolve the yeast in half of the lukewarm water with the 2 teaspoons of sugar, and set it aside to activate. When frothy, add it to the ingredients in the bowl.
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Knead only until the dough comes together (avoid overworking it, as this affects the gluten). Add the remaining water, as needed, to obtain a smooth dough.
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Shape the dough into a ball, cover the bowl with cling wrap, and let it rise for 1 to 1 ½ hours or until doubled in size.
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Punch down the dough with your fist to bring it back to its initial size. Cover it again with cling wrap, and refrigerate it for 1 hour to 1 hour and 15 minutes.
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Punch it down once more to its initial size.
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At this point, you can continue with the recipe or store the dough in the fridge overnight. In both cases, chill the dough in the freezer for 30 minutes first.
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When ready to continue, remove the dough from the fridge, roll it into a long rectangle, cover it with cling wrap, and return it to the fridge while you prepare the butter for the beurrage.
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Cut two pieces of baking paper and measure them against the rolled dough. Make two paper rectangles, each two-thirds the size of the dough. Fold the edges to create packets that will hold the butter securely.
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Divide your butter into 2 equal pieces, and put them into the 2 open paper packets. Close the paper packets and roll them from the outside until the butter fills the packets completely. Once the packets are evenly rolled, put them back in the fridge to firm up again. Make sure that both your rolled butter and rolled dough are very cold before proceeding, or the butter will leak and your pains aux raisins will not turn out properly.
Note: The original recipe calls for butter from the fridge, but I used room-temperature butter, and it worked just as well.
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When the butter has firmed up, remove the paper from one packet. Take the chilled dough out of the fridge and place the butter on the lower two-thirds of the dough. Fold the bottom third up over the butter, and then fold the top third down over the centre to create three layers.
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Roll the dough into a long rectangle again, and repeat the same simple three-fold turn, this time without adding more butter.
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Cover the folded dough with cling wrap, place it in the freezer for 30 minutes, and then refrigerate it for 1 hour.
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Roll out the dough again into a long rectangle approximately the same size as before, and repeat the same simple three-fold turns, the first one with the remaining butter and the next one without. At this stage, the dough should look smooth and evenly layered, similar to the reference photo. Flour your work surface regularly, and brush away any excess flour before folding.
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You should now have completed 4 single turns in total, one with butter, one without, a rest period, then one with the second portion of butter, and one last turn without.
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The dough is now ready, though it is best to leave it in the fridge overnight. Resting makes shaping the pain aux raisins easier and helps the butter firm up again, so it will not leak during rolling.