INGREDIENTS
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2 tablespoons olive oil
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2 shallots, halved
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1 garlic head, halved crosswise
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5 dried mushrooms (such as shiitake or porcini)
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5 celery stalks
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10 parsley stems
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2 strips lemon peel
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3 thyme sprigs
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1 bay leaf
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1 pound Parmesan rinds (about 3 large rinds)
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10 cups cold water