INGREDIENTS
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1 head (approx. 2 pounds) cauliflower
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7 tablespoons unsalted butter, divided
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1 leek, white and light green parts only, halved and thinly sliced
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1 small onion, halved and thinly sliced
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salt & pepper
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4 1/2 cups water
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1/2 teaspoon white wine or sherry vinegar
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3 tablespoons fresh chives, snipped