Ingredients

• 3 tablespoons warm water

• 1/2 teaspoon active dry yeast

• 1/2 cup bread flour

• 2 1/4 cups bread flour

• 2/3 cup water

• 1/2 cup granulated sugar

• 8 large egg yolks

• 14 tablespoons unsalted butter, cubed and softened

• 1/2 cup plus 1 tablespoon bread flour, plus more for dusting

• 2 tablespoons plus 1 teaspoon granulated sugar

• 2 large egg yolks

• 1/2 teaspoon vanilla bean paste

• 2 teaspoons fine sea salt

• 3 tablespoons unsalted butter, cubed and softened

• 1 cup roasted and skinned hazelnuts, chopped (see Note)

• 4 ounces dark chocolate chunks (1 cup)

• Two (6-inch) paper panettone molds

• 1 large egg beaten with 1 tablespoon water to make an egg wash

• Pearl sugar, for sprinkling