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Take the dough from the bowl, knock it down, knead lightly in your hands or on the counter and refrigerate for 30-45 minutes.
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Take the dough from the refrigerator, roll it out onto a lightly floured surface to a 38x20 cm rectangle.
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Take the rectangle of butter from the refrigerator, unwrap it and place it in the middle of the dough. Fold over the buttered side like you were folding a business letter. Seal the edges and rotate 1/4 turn.
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Roll out the dough with butter in it into a 0,5 cm thick rectangle, turn it to the left and fold into thirds (firstly, take the right part, then cover it with the left one) Wrap in plastic wrap and refrigerate for 30 minutes.
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Repeat this 2 more times (roll out, turn, fold, refrigerate).
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Finally, roll out the dough to 1,5 cm thick. Using a 6-7 cm cutter with a 2,5 cm center cut your cronuts.
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Put them aside on floured surface (or on a sheet of baking paper) and let rise until they are double in size, for about 2 hours.
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Heat up a pan with oil. There should be enough room for cronuts to move while boiling. Test the oil: put a small chunk of dough – if it separates too much and falls apart, the oil isn't hot enough, if it starts to burn, it's too hot, you want them to poof a little and turn golden brown.
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When your oil is hot enough, place the cronuts in, you want to put in enough that they are floating but not overcrowded.
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Cook it from 90 seconds to 2 mins on each side. Let them strain/cool on a cooling rack over paper towels.