Knead all ingredients, except the Croissant Butter, for 5 minutes at first speed.
Continue at second speed for 15 minutes, just until a well-formed silk dough.
Leave the dough at ambient temperature, for 30 minutes, well covered with a plastic sheet.
Degas the dough, plie into an oval form, place in the freezer for 30 minutes and give it a rest in the refrigerator at 1° à 4°C for 12 hours.
Flatten the dough and form into a rectangle.
Place in the laminated Croissant Butter sheet.
Cut the edges and place on top of the dough.
Give 1 single turn (plie in 3), followed by a second single turn (plie in 3).
Place in the refrigerator for 1 hour.
Stretch the laminated dough to 39 cm wide and 2.8 mm thickness.
Cut strips of 3 cm x 13 cm. Use 3 strips, layer together with 1 cm overlap.
Roll up and tuck the edges into the middle of the swirl.
Turn upside down and shape briefly by hand.
Place them in 7 cm diameter classic brioche moulds.
Ferment for 2 hours at 27°C and 70% humidity.
Bake at 170°C for 15 minutes in a ventilated oven.
Demould immediately after baking and roll into granulated sugar.