Weigh out the water and milk together with the sugar and salt and put in a mixing bowl.
Stir loosely with a hand whisk.
Add the rest of the ingredients.
Mix with a dough hook for 8 minutes on speed 1, then 4 minutes on speed 2.
The gluten development should be visible, allowing you to stretch out a thin window pane that tears.
This is important, because we will develop more gluten during the turning process.
Let the dough rest for 30 minutes on the worktop, covered with plastic.
Then roll it out to the size of a (freezer) tray 60 x 40 cm.
Cover with plastic and put in the refrigerator until the next day.
Roll out the dough to a thickness of 12 mm.
Place the slice of Croissant Butter in the middle of the dough, cut off the sides and place them on top of the butter so that everything is covered.
Roll the dough out again to 12 mm and fold into four.
Give the dough a quarter turn and roll out to a thickness of 14 mm.
Cut the sides straight again and fold the dough into three.
Roll out to a size of 60 x 30 cm and leave to rest in the freezer for an hour.
Roll out the croissant dough to a thickness of 12 mm and cut half of the rolled-out dough into 1 cm thick strips, enough to completely cover the other half of the base dough.
Give the strips a quarter turn so that the lamination layers are visible, then place them against each other on the croissant base dough.
Leave everything to rest in the refrigerator for 30 minutes.