Activate the Yeast (Create the Sponge): In a large mixing bowl, dissolve the yeast in the warm water.
Stir in 1 tablespoon of the sugar and about 2 cups / 240g (8.5 oz) of the flour.
Mix until you have a soft, spongy dough.
Cover the bowl with a clean towel and set it in a warm, draft-free place for about 45 minutes, or until it's puffy and bubbly.
Mix the Dough: To the activated sponge, add the warm milk, the remaining 1 tablespoon (15 ml / 0.5 fl oz) of sugar, the salt, and the melted butter.
Stir well to combine. Gradually add the remaining flour, about one cup at a time, until a fairly stiff dough forms that pulls away from the sides of the bowl.
Knead the Dough: Turn the dough out onto a well-floured surface.
Knead for 10 to 15 minutes, adding small amounts of flour as needed to prevent sticking. The dough is ready when it becomes smooth, supple, and elastic.
First Rise: Form the dough into a smooth ball.
Place it in a large, buttered bowl, turning it over once to coat the entire surface with butter.
Cover with a towel and let it rise in a warm place for 45 to 60 minutes, or until it has doubled in size.
Shape the Loaves: Gently punch down the risen dough to release the air.
Divide it into two equal portions.
Shape each portion into an oblong loaf or a large braid.
Second Rise (Proofing): Place the shaped loaves on buttered baking sheets.
Cover them loosely with a towel and let them rise in a warm place for another 30 minutes, or until they have nearly doubled in size.
Prepare for Baking: While the loaves are proofing, preheat your oven to 425°F / 220°C.
In a small bowl, whisk together the egg yolk and 1 tablespoon (15 ml / 0.5 fl oz) of milk to create the glaze.
Glaze and Bake: Gently brush the tops of the loaves with the egg wash glaze.
Place them in the preheated oven.
Bake for 5 minutes, then reduce the oven temperature to 375°F / 190°C.
Continue baking for another 35 to 40 minutes, or until the loaves are a deep golden brown and sound hollow when tapped on the bottom.
Cool Completely: Transfer the baked loaves to a wire rack to cool completely before slicing. This step is crucial for the crumb to set properly.
Enjoy!
