To make this bread easier to prepare, shape the dough into two loaves after the second rising instead of forming braided loaves, as is traditional. Place each loaf in a buttered 9x5x3-inch loaf pan and continue as per recipe.
04Punch down dough. Cover with plastic and clean kitchen towel and let rise 30 minutes.
05Grease 2 large baking sheets. Turn out dough onto lightly floured surface. Divide dough into 2 equal portions. Divide each portion into 3 equal pieces. Roll each piece into 9-inch-long rope. Braid 3 ropes together; pinch ends together to seal. Repeat with remaining dough pieces, forming 2 braids. Place each braid on baking sheet. Cover with towel . Let rise in warm area until almost doubled, about 30 minutes.
06Preheat oven to 400°F. Whisk yolk with 1 tablespoon water to blend. Brush dough with egg mixture. Bake 10 minutes. Reduce oven temperature to 350°F. Bake until bread is golden brown and sounds hollow when tapped on bottom, about 35 minutes. Transfer loaves to rack and cool completely. (Can be prepared 1 day ahead. Wrap tightly in plastic and store at room temperature.)