Now get your butter out and let it soften for about 10 minutes, and verify its temperature is between 15-18 degrees Celsius (not less or it will break and marble, no more or it will be absorbed by the dough)
Take your dough out of the fridge and place it on a lightly floured work surface
Gently press the dough to release all the gas bubbles. Give your dough a 38 cm X 17 cm shape, so the width with the butter block coincide and the length is double
Put the butter in the middle and using a knife or cutter, cut the extra dough pieces back and forth
Now cover your butter with these extra dough and make sure to press gently on the joint two pieces of dough to close it like a book (seal it by pressing gently with the pastry roll)
Start to roll your dough along the direction of that newly formed line in the middle, by first pressing gently along the dough to create waves
Then roll from the middle to the upper side then from the middle to the lower side. Keep rolling until you obtain a dimension of 45 cm
Now we will do a double fold: Bring one extremity to ⅓ and the other to ⅔. Press gently on the junction with your roll. Then fold it back on itself (remove excess flour and brush a bit of water to stick them together)
Gently roll over the dough, very lightly and put that dough in a Ziplock bag and in your fridge for about 1 hour
Gently flour the work surface, take your dough out of the fridge and place the closed extremity at your left, as if you had a book in front of you and wait 10 mins for the butter to soften a bit. Gently create waves on your dough and roll it to give it a length of 45 cm
Now we will do a simple fold: Bring one extremity to ½ and the other to cover it. Then place your dough in a Ziplock bag and in the fridge for at least 3 hours