For the Yeast Sponge:

1. In a large mixing bowl, combine the milk, water, yeast, and 1/4 cup of the sugar with a whisk. Stir until the yeast and sugar have completely dissolved. Mix in 1 cup of flour until well blended.
2. Cover with plastic wrap and let stand in a warm place for 1 hour, or until bubbly and doubled in size.

For the Dough:

1. In the bowl of a stand mixer fitted with the paddle attachment, mix together the remaining 1/2 cup sugar, melted butter, egg yolks, sour cream, and vanilla on medium-high speed until combined.
2. Add the risen yeast and flour mixture, and stir well.
3. Whisk together the cardamom, salt, and 3 cups flour in a separate small bowl. Add the wet mixture, and mix to make a soft dough.
4. Turn the dough out onto a lightly floured work surface, using the remaining 1/2 cup flour as needed. Knead in the raisins, candied fruits, and almonds. Continue to knead for 5-8 minutes, until the dough feels soft and elastic. Alternately, knead in the stand mixer using the dough hook attachment. Knead for the same amount of time, until soft and elastic. 
5. Shape into a ball, and place in a large, lightly greased bowl, turning once to coat the entire ball of dough. Cover with plastic wrap and let the dough rise for about 1 hour, or until doubled in size.
6. Punch down dough, kneading a few times. Generously coat a medium-sized springform panettone pan* with cooking spray. Place the dough in the mold. Cover with plastic wrap and let it rise for 1 hour, or until the dough reaches about 3/4 of the way up the inside of the pan.

For Baking:

1. Preheat the oven to 400°F. Put the bread pan on top of a sheet pan, and place in the oven. Bake for 10 minutes. Reduce heat to 350°F. Bake another 35-40 minutes, or until a wooden pick comes out clean.
2. Remove from the oven and let cool for 20 minutes. Remove the bread from the pan and let cool completely on a wire rack.

For the Icing and Decorating:

1. While the loaf is cooling, prepare the icing. In a small bowl, mix together the confectioners’ sugar, lemon juice, almond extract with enough warm water to make a smooth, thick, and slightly runny glaze.
2. Drizzle the glaze over the top of the cooled bread. Garnish with assorted toppings. Let set until firm. Cut the bread into wedges, and serve!