Preparation
Place the flour in a bowl and make a well in the centre.
Crumble the yeast into the well. Pour in 3tsp lukewarm water, add the sugar and mix with a little flour. Let the pre-dough swell, covered, for 15 minutes.
Add the egg, butter and salt to the pre-dough, and knead everything with 200ml lukewarm water to a smooth dough. Cover and leave to rise for 45 minutes.
Preheat the oven to 180°C (160°C fan, gas 4). For the filling, crush the feta with a fork and mix it with 75g butter. Knead the dough on a floured surface once more and divide into 4 portions. Flatten each portion into a circle about 3mm thick, and spread with some feta butter. Roll in the dough.
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Cut the roll slightly diagonally, once to the right, once to the left, into pieces.
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Melt the butter over low heat and greasae the tin with it. Roll out the remaining dough, fill it in the same way and cut into pieces.
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Place the dough pieces side by side in the baking tin.
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Cover and leave to rest again for 30 minutes.
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Mix the egg yolk with the remaining butter and brush over the dough. Bake in the oven for 40 minutes until golden brown.
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