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1
For the octopus:
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Cut the head off the octopus. Combine the tentacles, parsley, olive oil, oregano, thyme, shallots and garlic in a cast-iron pot over medium-high heat. Cover and gradually bring the mixture to a boil. You don't need to add any liquid to the pot because the octopus will release its own braising liquid. Once it comes to a boil, reduce the heat to medium-low and simmer for 1 hour.
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3
Remove the octopus from the heat and let cool in the braising liquid. On a large piece of plastic wrap, lay the tentacles top to tail. Season with salt and cracked pepper. Tightly roll up (it should look like a long sausage). Use more plastic wrap to secure the octopus, if necessary. Refrigerate for at least 4 hours (or overnight) to set.
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4
For the potato salad:
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5
Combine the gherkins, capers, oil, mustard, vinegar, potatoes, shallots, chiles, chives and parsley in a large bowl. Season with salt and pepper.
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To serve, unwrap the octopus and thinly slice. Divide the octopus among plates, drizzle with olive oil and garnish with lemon zest and celery leaves. Serve the potato salad alongside.
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7
Cook's Note:
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The octopus head can be reserved and then sliced and eaten with the rest of the dish.