METHOD
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prepare the dough
In a bowl of a stand mixer fitted with the dough hook, combine flour, lukewarm milk, sugar, egg, vanilla, active dry yeast, and lemon zest. Mix for 8 minutes, then add the salt, butter, and olive oil and continue to mix for an additional 10 minutes or until the dough is elastic and smooth. Cover the bowl with clingfilm and set aside to proof at room temperature for 45 minutes, allowing the dough to rise. Feel free to knead the dough by hand if you don't have a stand mixer.
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shape the dough
Divide the dough into 14 parts. Each should weigh around 70g / 2.5 oz. Shape into round balls with your hands. Line two large baking sheets with parchment paper and place the balls on top. Ensure there is sufficient space between each ball for proofreading. Cover with a kitchen towel and set aside to proof at room temperature for 1 to 1.5 hours or until visibly risen. Set a rack in the middle of the oven and preheat it to 210 °C / 410°F.
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bake
In a bowl, beat together an egg and milk. Brush the buns with the mixture. Place the first pan in the oven and bake for 16-18 minutes at 210°C / 410°F, or until golden brown and cooked through. After about 8 minutes of baking, turn the baking sheet 180 ° if they are getting brown too fast. Repeat the process with the remaining ingredients. Remove the baked buns from the oven and transfer them to a wire rack to cool. Then, bake the remaining buns.
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filling
Add the whipping cream, vanilla, and sugar to a bowl. Beat with an electric mixer until stiff peaks form. Cut the cooled buns vertically in half, ensuring that the cut does not go all the way through them. Generously pipe the chocolate cream first, then a generous layer of whipped cream. Repeat the process until all the buns are used, then serve.