Preparation
Wash the potatoes and cook in a pan of boiling salted water for 20-30 minutes until tender.
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Drain and peel the potatoes, then press them through a potato ricer and allow to cool.
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Place the flour in a bowl, make a well in the centre, and crumble in the yeast. Mix in the sugar and 4 tbsp lukewarm water until smooth. Cover and leave to rise for about 15 minutes.
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Add about 150ml lukewarm water, the egg, oil, salt, chopped herbs and potatoes to the yeast mix and knead thoroughly. If needed add some water or flour to make a smooth dough. Cover and leave to rise for another 30 minutes.
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Brush a baking tray with oil.
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Knead the dough thoroughly. Shape into a long roll, then place on the baking tray and curl into a snail shape. Cover and leave to rest for 30 minutes.
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Preheat the oven to 180°C (160°C fan, gas 4). Bake the bread for 50 minutes until golden brown. About 10 minutes before the end of the baking time, brush the cake with beaten egg yolk to glaze.
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Sprinkle with sesame seeds and coarse salt. Transfer the bread to a wire rack to cool. Garnish with fresh herbs.
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