Use a microwave or the stovetop to heat the milk until lukewarm. Add the sugar and yeast, and stir slightly. Set the mixture aside for 5-10 minutes until the yeast is dissolved and bubbly.
Add the flour to a mixing bowl, and create a well in the middle. Pour the milk mixture into the well, then stir together.
Cover the bowl with a towel, and set it aside in a warm place to rise. After 30 minutes, transfer the dough to a floured work surface. Add the egg yolks, lemon zest, and the dried fruit and nut mixture. Knead the ingredients together until combined and the dried fruits and nuts are evenly distributed.
Divide the dough between two greased loaf pans. Sprinkle a tiny bit of water on top of each loaf to retain moisture, then cover and let rise for an hour, or until doubled in size.
Preheat the oven to 400°F, and bake the loaves for 30-35 minutes.
To serve, dust the loaf with powdered sugar, then toast individual slices and top with butter.