In the bowl of a stand-up mixer cream flour, sugar, yeast and butter at slow speed.
Add eggs one by one, milk, orange blossom, salt and zest. Turn speed to medium and mix for about 10 minutes.
Place the dough in a greased bowl and cover. Let it rest for 1 hour in a warm place or until it doubles in size.
Punch the dough in the middle and turn over a floured surface. Divide in 7 equal parts. 6 of those parts will become your loaves and the last one will be used to make the decorations. This video shows how to make the loaves, the "bones" that will go on top of them and how to place them. It is in Spanish but it is visually self-explanatory. Basically, you form the 6 loaves, place them on a greased baking sheet and let them double in size, covered. The bones and little balls to decorate the bread are placed on a plate, covered and put in the fridge to keep them firm and avoid they expand.
Pre-heat oven to 180°C (about 355°F).
Decorate the bread (refer to video) and bake for about 20 minutes. It will be ready when it is golden brown in the outside.
In the meantime melt the 2 TBSP of butter in a small pot. As soon as the bread comes out of the oven brush melted butter and sprinkle sugar over them. You can also place the sugar on a flat plate and roll the loaves in it.
Let the bread cool down and enjoy with a cup of hot Mexican chocolate.
Recipe by What's Cooking, Mexico? at http://whatscookingmexico.com/2009/10/30/pan-de-muerto-bread-of-the-dead/