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3/4 cup heavy cream
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4 pounds kale, tough stems discarded
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3 tablespoons unsalted butter
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3 tablespoons extra-virgin olive oil
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1 medium onion, thinly sliced
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1 tablespoon plus 1 teaspoon Madras curry powder
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1/2 cup low-sodium chicken broth
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One 8-ounce can whole water chestnuts, sliced 1/4 inch thick
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Salt and freshly ground black pepper
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In a small saucepan, bring the cream to a boil. Simmer over moderately low heat, stirring often, until reduced to 1/3 cup, about 7 minutes.
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Meanwhile, in a large pot of boiling water, cook the kale until tender, about 5 minutes. Drain the kale, and when it's cool enough to handle, gently squeeze out the excess water. Coarsely chop the kale.
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In a large, deep skillet, melt the butter in the olive oil. Add the onion and cook over moderately low heat, stirring occasionally, until softened, about 7 minutes. Add the curry powder and cook over moderate heat, stirring, until fragrant, about 3 minutes. Stir in the chicken broth and water chestnuts and bring to a boil. Add the kale and reduced cream and toss. Cover and cook over moderate heat, stirring a few times, until the kale is sizzling, about 3 minutes. Season with salt and pepper and serve.
Make Ahead
The kale can be refrigerated overnight; reheat gently, adding a few tablespoons of chicken broth as needed.