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1
If using fresh artichokes, trim away the tough outer leaves and remove the choke. Bring a large saucepan three-fourths full of water to a boil. Drain the artichokes, add them to the boiling water along with the lemon half, and parboil for 5 minutes. Drain and set aside. (There is no need to parboil frozen artichoke hearts).
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2
If using salt-packed capers, soak in water to cover for 5 minutes, then drain and pat dry. If using brine-packed capers, rinse under cold running water, then drain and pat dry. Set the artichokes and the capers aside.
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3
In a saute or deep frying pan, heat 2 Tb of olive oil over medium-low heat. Add the onions and saute lightly until softened and golden, 5-6 minutes. Add the garlic, parsley, and artichokes, and cook, tossing every so often and adding a little more oil if the artichokes begin to scorch, until they are fragrant and lightly golden, about 10 minutes. Season the artichokes to taste with salt and pepper.
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4
Add 2 more Tb of olive oil, 1 cup of stock, the capers, lemon zest (if using), lemon juice, and the basil. Raise the heat to high and bring to a boil. Reduce heat to medium and cook, uncovered, until the artichokes are tender and the liquid has evaporated to a thickened and flavorful sauce, about 20 minutes. If the liquid is in danger of boiling away before the artichokes are tender, add more stock as needed.
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5
Transfer to a serving bowl and serve hot or at room temperature.
