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1
Preheat the oven to 400 F, 200 C, gas mark 6; peel the potatoes and cut them into evenly sized halves or chunks.
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2
Put the potatoes into a large saucepan, cover with cold salted water and bring to the boil; drain the water off as soon as it comes to the boil - this step isn't to cook the potatoes: it heats them through so they start roasting more quickly - return the potatoes to the hot pan and dry them over the heat (it is important that the potatoes are dry for roasting, otherwise they are likely to stick to the baking tray).
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3
Slide a large baking tray into the oven to heat up for a few minutes, add the vegetable fat to the potatoes in the hot pan and let it melt; turn the potatoes in the melted fat until they are shiny and well coated, then tip them onto the hot baking tray.
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4
Place the tray in the oven for about 45 minutes; add the bay leaves, if using, 15 minutes into the cooking time; turn and baste the potatoes a few times during cooking.
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5
To serve, lift the potatoes from the baking tray with a slotted spoon, sprinkle with sea salt if desired: NOTE - if you are unable to serve the potatoes immediately, do not cover them (they'll loose their crispiness); instead keep them warm in the oven until you are ready.
