Either by hand or by machine, mix the yeast and the milk first (until the yeast is lightly dissolved), then add the remaining ingredients except for the butter which you should add at the end. Mix until the dough is soft and smooth, which will take you aproximately 15 minutes by hand or half (7 minutes) in the machine.
Let the dough rest for 20 minutes, or until it feels fluffy. Or covered overnight in the fridge (you can also freeze after its been in the fridge)
Divide the dough into 2 equal halves, and roll into a 10-12'' cirle
Place a piece of parchment paper over the baking tray and place one of the halves. Using a spatula put a layer of pesto and then sprinkle the cheese (I used mozarella). Make sure that you don't add too much cheese as it will come out once you form the star
Place the second dough on top and place a small glass in the centre of the circle
At this moment you can trim any excess dough to make the best circle you can make
Use a knife to cut through all the layers of dough at the 12 o'clock, 3 o'clock, 6 and 9 points.Divide each quarter of the circle into two more segments. You should have 16 segments. Remove the glass from the centre and twist "side by side" pieces of dough away from each other. Repeat this process all the way around.Pinch the ends of each pair of dough twists so they hold together whilst baking. Prepare egg wash and using a brush go around the dough and let it rest for 30 minutes.
In the meantime preheat the oven to 350°F
Bake for 30-40 minutes until golden brown - serve hot!