Dissolve yeast in warm milk,add pre-washed,dried and coated in flour raisins.Slowly introduce the egg yolks,sugar,vanilla,rum,zest,softened butter and flour.Knead the dough and put it in a warm place to "approach". Monitor test as soon as it starts to bubble and freely behind the walls of the cookware,it is ready.(This dough can be covered with a lid and put on 1-2 days in the fridge and then just bake).Greased and sprinkled with breadcrumbs (or semolina) form to fill the dough and put for 30 minutes in a warm place until the dough has come.Bake in the oven at 180 degrees for 45-60 minutes.When the cake has cooled,carefully remove it from the form,cover with a napkin and allow to cool completely.Before serving, sprinkle with powdered sugar (or as I have to cover with icing). This dough is perfect for baking cakes.