Take the distempered dough from the refrigerator and place it on a floured work surface. Roll it out to a thickness about 1 cm.
Place the cocoa butter pastry at the center of the distempered dough (adjust the size if necessary, the butter pastry must be totally wrapped by the distempered dough).
Fold each side of the distempered dough over the cocoa butter pastry to trap it in.
Roll out the dough lengthwise until you get a thickness of about 8 mm. Make a single turn. Make a quarter turn. Roll out the dough again and make another single turn.
Wrap the dough with the film and take it to the refrigerator for at least 2 hours.
Take the dough out and make 2 more turns as explained above. Put the dough back in the refrigerator for 2 hours, then, proceed as above a 3rd time. The dough is ready but it needs chilling for more than 2 hours before it can be used.