Place the flour, instant yeast, sugar and salt into a large bowl and stir to combine creating a well in the center.
Add the lukewarm milk and eggs and stir the mixture until the mixture is a shaggy dough.
Toss in the room temperature 65 grams / 2.29 ounces butter and combine until the dough comes together.
Knead until the dough feels smooth and the butter has ben fully incorporated, approximately 10 minutes with a hand beater.
Cover with a wet tea towel and set aside in a warm place until doubled in size, for at least 2 hours.
Meanwhile, place the large portion of butter between two pieces of greaseproof paper and tap lightly with a rolling pin to flatten until you can roll it out to a 23 cm / 9 inch ¼ inch thick square with nice even edges. Chill until ready to use.
Once the dough has doubled in size, punch to deflate and invert onto a lightly floured surface.
Roll out to a 35 centimeter / 14 inch square and place the butter centered diagonally on top so you have the square dough with a diamond butter square in the center.
Fold the corners of the dough over like you would if you create a square envelope to fully cover the butter, ensuring you cannot see any of it once the dough is pinched closed.
Roll the dough out in one direction to a 20x30 cm / 8x12 inch rectangle and then fold the rectangle in 3, to a wide rectangle.
Cover and refrigerate for 20 minutes before repeating the roll out process twice more to a 20x30 cm / 8x12 inch rectangle and 3 way rectangle fold and refrigerate.
Preheat your oven to 200C/400F and line a baking tray with greaseproof paper.