The night before beginning the recipe, or at least 1-2 hours in advance, soak the dark and golden raisins in the rum. Cover with plastic wrap.
In the bowl of an electric stand mixer fitted with a paddle, dissolve the yeast in the warm water. Add the sugar and oil and stir to combine. Beat in 4 of the eggs, one at a time, on med-low speed (I use level 2 on my KitchenAid).
In a separate bowl, combine all of the bread flour, 2 cups of the all-purpose flour, and the salt.
Add the flour mixture gradually to the yeast mixture, stirring to combine. When the mixture comes together to form a dough, stop the mixer and switch to a dough hook.
Turn the dough hook to knead on to the lowest setting, set a timer for 5 minutes and gradually add another 1.5 cups of all-purpose flour. You should be left with a smooth and elastic dough. If you would like to knead by hand – knead well for about 10 minutes.
Turn the dough out onto a lightly floured surface and pat down a well in the center. Add the raisin and rum mixture, and another 1/4 cup of flour. Knead the mixture into the dough. IF the dough is too sticky, add the remaining 1/4 cup of flour as needed.
Place the dough into a large oiled bowl, and turn it around in the bowl a few times to grease the dough. Cover with plastic wrap, and place in a warm location for 1-2 hours, until the dough is almost doubled in size.
Remove the dough, and punch it down (the harder the better! take some aggression out). Return it to the bowl, cover again, and rest for another 30 minutes in a warm place.