Mix the Dough: Combine whole milk, whole grain flour, plain flour, caster sugar, unsalted butter, dry yeast, and salt in a mixing machine. Mix until the dough forms with a nice elastic shape.
First Dough Rest: Cover the dough and let it rest to develop the gluten.
Prepare Butter Block: Cut off half of the butter block and place it on top of the remaining butter block to form a thicker layer.
Laminate the Dough: Start the lamination process by wrapping the dough nicely around the butter block.
Rolling and Cutting: Roll the laminated dough to a final thickness between four and five millimeters, then cut into croissant shapes.
Second Dough Rest: Give the cut croissants a bit of rest before the final preparation.
Egg Wash: Egg wash the croissants before baking.
Baking: Bake the croissants at 170 degrees Celsius until golden brown and flaky.