Start preparing the yeast combining the active dry yeast with flour, sugar and warm milk. Mix well, cover and let the yeast ferment for a few minutes in a warm area of the kitchen. When it doubles and starts bubbling is ready.
Stir the yeast and let it rise again. You will do this three times. When the yeast is fermented add it to a bowl and combine with the eggs and the yolks using the stand mixer. The eggs and yolks have to be room temperature and added one by one.
When the yeast and the eggs are blended, that is the time to start adding the sifted flour a spoon at a time. Then add to the mix the sugar and the salt. When all is integrated add the orange blossom water and the orange zest. Continue mixing.
Remove the beater and insert the dough hook to the stand mixer. Continue mixing at medium speed and start adding the butter slowly. Knead on the machine for 20 minutes.
Remove the dough from the mixing bowl. The dough will be sticky, so add some flour to the surface and knead by hand for the other 20 minutes. You can take your time and let the dough rest for a few minutes. This dough requires to be worked to develop the gluten and allow the bread to be soft and moist.
When the dough doesn't stick to your fingers or the surface and when extended doesn't rip in the process, that is the signal the dough is ready for the next step.
Make a round loaf and place it inside a plastic container with a lid. The container must be coated with oil to avoid sticking. Close the lid and let the dough rise on a warm area withing the kitchen.
When the dough doubles remove from the container and punch. Add some flour and knead again. Form a round loaf and cut in four pieces. One of the pieces of dough cut again and use it for making the decorations.
Take each piece of dough and form round four loaves making sure the seam of the bread goes on the bottom to allow each loaf to look perfectly round.
Take the portion of the dough for the decorations and add flour. Work the dough until it achieves a playdoh texture. For making the bones, form a cylinder and roll forward first with one finger and then with two. The back and forth movement will help stretch and divide to make a bone shape. For making the top part of the skull just make a little ball with the dough.
On the top of the loaf make a cross of water with the baking brush. This will help the decorations to stick. Add the bones and little ball to goes on top and let the bread rise again for about an hour. Bake in the oven at 350 degrees Fahrenheit for 15-30 minutes
Test the temperature of the bread using a digital instant-read thermometer. Stick the thermometer's probe into the thickest part of the loaf, which is usually the middle. Wait a few seconds for the reading to appear. If the temperature reads between 190 and 210 degrees, the bread is done.
Place on a rack to cool and brush the bread with melted butter. Sprinkle the bread with caster sugar and enjoy.