Place the yeast and milk in a bowl and allow to dissolve for 3 minutes.
Once bubbling, add the flour, sugar and egg and beat on low until you have formed your dough.
Let rest for 10 minutes.
On a low setting with your mixer, add in 1 cube of butter or 2 (if your cubes are small, no more than 10 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, for 2 hours or preferably overnight.
Remove the dough and divide equally into 12 portions.
Take one piece of dough in your palm and fold the edges inwards, rolling to create a nice smooth top.
Place each roll seamside down into your baking dish.
Repeat with the remaining dough and allow a gap around each roll as you place it into your baking dish.
Cover and allow to rise at room temperature until doubled in size, approximately 1 hour.
Preheat your oven to 190C/30F and place the rolls into the oven to bake until golden for 25 minutes.
Meanwhile, stir the melted butter, honey and rosemary together in a small bowl.
Remove the buns from the oven and brush with the melted butter mixture over the entire tops of your buns.
Sprinkle over a little pinch of salt on top of each bun and allow to cool for 15 minutes.
Serve up and dig in!