Place panettone mold or pan of choice on a baking sheet. If using a springform pan, light grease the sides and bottom of the bottom just to make sure it doesn't stick. (You may also like with parchment, but I didn't.) Drain the dried fruit mixture.
Take the panettone dough out of the fridge and turn out onto a floured workspace. Flour your rolling pin as well and roll dough into a flat rectangle that is approximately 12- by 15-inches. It's okay if it's not an exact measurement.
Spread the drained fruit and the almonds (if using) evenly over the top. Use the rolling pin to forcefully roll the fruit into the dough, embedding them in as mush as possible.
Fold the short sides of the fruit-covered dough toward the center into thirds, like a letter. You will end up with a rectangle of dough with a shorter side facing you. Fold the bottom half of the rectangle to meet the top, forming a square. Pat the square of dough to a thickness of about 1-1/2 inches.
Now form the dough into a circle. You can either lift the corners in toward the center, or push the corners down and tuck them under. Pinch the loose ends together to seal on top. Cup both hands on either side of the dough and rotate the dough little by little to shape into a round.
Place the dough seam side down inside the panettone mold or springform pan. (If using a tube pan, shape the dough into a thick snake.) Cover with plastic wrap and let rise in a warm place for 1-1/2 to 2 hours, or until the dough reaches the top edge of the mold or has tripled in size.
About 30 minutes before the panettone is ready to be baked, set the oven rack to the lower third of the oven. Preheat the oven to 375°F (190°C).
Once the dough has risen, use a sharp knife (or a stainless razor blade) to score a shallow cross on the top surface of the dough from edge to edge. Do not slice deeply into the dough, simply score it. Place the cold Tablespoon of butter in the center of the cross.
Turn the oven down to 325°F (160°C). Bake the panettone for an initial 30 minutes. Place a piece of foil loosely over the top to keep it from browning too much, then continue to bake for 35 to 45 minutes****, or until golden brown. An instant read thermometer will help to identify if the panettone is cooked through. Inserted into the center of the dough, it should register 195°F (90°C).
Remove panettone from the oven right away and transfer to cooling rack. Let cool completely in the paper mold before serving. (If using a springform pan, unmold once cool.)
Slice the bread and serve as is, or toasted, with some cheese, or butter and jam. Since this is a dessert bread, it pairs well with wine, but it also pairs well with coffee as a sweet breakfast bread. Try it with Spiced Orange Iced Coffee (recipe below)!