INGREDIENTS
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2 leeks, including 2 inches of green, roots trimmed
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2 tablespoons olive oil
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2 tablespoons unsalted butter
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1 celery rib, with extra leaves, coarsely chopped
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2 tablespoons finely minced garlic
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2 teaspoons curry powder
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2 teaspoons ground ginger
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6 cups chicken or vegetable broth (more if necessary)
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Juice of half a lemon
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1 head cauliflower, cored and broken into florets
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1 cup half-and-half
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Salt and freshly ground black pepper, to taste