Place the yeast and milk in a bowl and allow to dissolve for 3 minutes.
Once bubbling, add the flour, sugar and mixed spice and beat on low until the mixture resembles a shaggy mixture.
Add the eggs and combine on low speed until fully combined until you form a dough.
On a low setting with your mixer, add in 1 cube of butter or 2 (if your cubes are small, no more than 5 grams or ? tablespoon of butter at a time) and incorporate until you cannot see any butter remnants in your dough.
Continue by adding another piece of butter and mixing until it is fully incorporated into your dough.
Beat for a further 5 minutes until the dough it looks slightly glossy and is pulling away at the sides of your bowl.
Lightly butter a bowl and place the dough therein, placing in the fridge to rise until doubled in size, approximately 1 hour.
Remove from the fridge, lift and allow the dough to fully deflate.
Cover the bowl and refrigerate for several hours or preferably overnight.
The next day, place the dough onto a lightly floured surface and roll out to an equal rectangle and ¼ inch thickness.