Mix the soft Croissant Butter with the flour (1).
Roll out the dough into a 40 x 60 cm rectangle and leave to cool in the refrigerator for 1 hour.
Knead the dough with the water, salt, vinegar, and cold melted Brioche Butter.
Leave to cool for 1 hour.
Wrap the dough with the kneaded butter.
Do one double turn (1 x 4), then leave to rest for 2 hours.
Do another double turn (1 x 4), then leave to rest for 2 hours.
Finally, do one single turn (1 x 3) and leave to rest for 1 hour.
Roll out the dough and divide into pieces 3 x 3 cm.
Bake on a Silpain® at 200°C for 20 minutes.