1. Making the croissant dough
Combine the dough ingredients and knead for 3 minutes until the dough comes together and you’ve reached the stage of low to moderate gluten development. You do not want too much gluten development because you will struggle with the dough fighting back during laminating. Shape the dough like a disc, not a ball, before you refrigerate it, so it will be easier to roll it into a square shape the following day. Place the disc on a plate, cover with clingfilm and leave in the fridge overnight.
2. Laminating the dough
Cut the cold butter (directly from the fridge) lengthwise into 1,25 cm thick slabs. Arrange the pieces of butter on waxed paper to form a square of about 15 cm x 15 cm. Cover the butter with another layer of waxed paper and with a rolling pin pound butter until it’s about 19 cm x 19 cm. Trim / straighten the edges of the butter and put the trimmings on top of the square. Now pound lightly until you have a final square of 17 cm x 17 cm. Wrap in paper and refrigerate the butter slab until needed.
Take the dough out of the fridge. With a rolling pin roll out the dough disc into a 26 cm x 26 cm square. Try to get the square as perfect as possible and with an even thickness. Get the slab of butter from the fridge. Place the dough square so one of the sides of the square is facing you and place the butter slab on it with a 45 degree angle to the dough so a point of the butter square is facing you. Fold a flap of dough over the butter, so the point of the dough reaches the center of the butter. Do the same with the three other flaps. The edges of the dough flaps should slightly overlap to fully enclose the butter. With the palm of your hand lightly press the edges to seal the seams.