A mandolin is just an update of the guillotine, but for a vegetable. It is a dangerous but invaluable tool for any kitchen. Even in professional kitchens people struggle to keep their fingers free from harm, but if you do master the mandolin, it will result in a superior product. To truly suffer for your art, you may have to lose a few fingers along the way.
To make the caramelised onions, heat the oil in a heavy-based saucepan over low heat. Add the onion and cook for 2 hours, stirring every 10 minutes, until the natural sugars caramelise and turn the onions brown. Allow to cool.
Use a mandolin or sharp knife to thinly slice the potatoes — they should be about
Meanwhile, follow the instructions for making olive oil dough. To shape the dough, divide it into two even-sized portions. Roll out each portion to create a
Reduce the oven temperature to 200°C (400°F/Gas 6) and
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