Combine the water and sugar in a saucepan and bring to a boil. Cook the syrup just until the sugar is dissolved then remove from heat and add the raisins and ginger.
Let them cool in the syrup then stir in the rum and macerate the raisins at least 1 day, preferably 3 days for a better flavor. Although they can be stored in the fridge in an airtight container for up to 2 weeks.
Combine all the ingredients in a bowl and mix well then cover the bowl with plastic wrap and let the pre-ferment rise at room temperature overnight. Do not skip this step!
Chocolate Sweet Bread:
Combine the pre-ferment, flour, cocoa powder, eggs, vanilla, orange zest, milk, yeast, sugar and salt in the bowl of your mixer.
Knead the dough with the dough hooks for 1 minutes then gradually stir in the softened butter and mix at least 10 additional minutes or until the dough doesn't stick to the sides of the bowl anymore.
Drain the raisins well and fold them into the dough, adding the chocolate chips and almond slices as well.
Cover the bowl with plastic wrap and let it rise at room temperature for 1 hour.
Combine the three ingredients in a blender or food processor and pulse until smooth and fluffy.
Finishing the Bread:
Preheat your oven to 400F-200C.
To finish the sweet bread, slightly grease your working surface with vegetable oil then transfer the dough on your working surface.
Using your hands (Don't use a rolling pin as it tends to deflate the dough too much), spread the dough into a rectangular.
Spoon the filling over the dough and spread it into a thin layer.
Carefully roll the dough into a log and place it in a loaf pan lined with parchment paper.
Let the dough rise 20 additional minutes then mix the egg yolk with a tablespoon of milk and brush the bread with this mixture.
Bake at 400F - 200C for 15 minutes then lower the heat to 340F - 170C and bake 30 additional minutes.
Let the bread cool in the pan for 10 minutes then transfer it on a cooling rack.
Slice the bread only when chilled.
Recipe by Pastry Workshop at http://pastry-workshop.com/chocolate-sweet-bread-cozonac-cu-ciocolata/