METHOD
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prepare the dough
Make the dough for the braided bread. Combine flour, vanilla, lukewarm milk, yeast, sugar, salt, and eggs in a bowl of a stand mixer fitted with a dough hook. Knead for 5 - 8 minutes, then add the butter and knead until incorporated, for about 5 minutes. If you don't have a stand mixer, use a hand-held electric mixer fitted with dough hooks. The dough should be elastic and soft. Cover the bowl with a kitchen towel or cling film. Leave to proof for one hour at room temperature, then transfer to a fridge for 30 - 60 minutes.
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shaping
Add the proved dough to a lightly floured working surface. Divide the dough into three parts. Shape each piece into a 60 cm / 24-inch long rope. Twist dough loosely to form a braid, then form into a ring on the parchment paper-lined baking sheet, leaving three spaces for eggs. Seal the ends of the braid together, and set whole eggs into the spaces in the dough. Cover loosely with a kitchen towel or clingfilm and set aside to proof at room temperature for 60 - 90 minutes or until visibly risen. Place a rack in the middle of the oven and preheat it to 190 °C / 375 °F.
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bake
Brush the braided bread with a mixture of whipped eggs and milk. Sprinkle with chopped hazelnuts. Place in the preheated oven on the middle rack and bake for 25 - 30 minutes at 190 °C / 375 °F. Remove the baked braided bread from the oven and set aside to cool, then cut into slices and serve.