The dough is easier to make in a mixer but with a bit of work can be done by hand as I did here.
The dough ......
500g Strong Bread Flour
250g warm full fat milk
60g Unsalted butter at room temperature
7g dried yeast or 15g Fresh yeast
2 large eggs
45g caster sugar
If you are making in a mixer add the liquid first then the dry ingredients and mix slow to start then turn the speed up and keep it going till the dough becomes smooth and no longer sticks to the side of the bowl. If making by hand ...... keep working the dough! It's going to take a while.
If by hand then .... In a large bowl combine all the dry ingredients then rub the butter into the mixture. Combine the egg and milk then add to the bowl .... use a plastic bread scraper, it's going to be a very sticky dough to start .... don't be tempted to add any more flour! Mix it in till well combined in the bowl then turn out onto the bench. Lift the dough, slap it back down and over the top ...... keep doing this, stopping to bring the dough back into a ball shape with a bread scraper whenever needed until it's smooth and elastic.
After this stage you need to rest the dough in a warm place, covered with a cloth in a clean bowl until doubled in size.