INGREDIENTS
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4 cups (loosely packed) day-old
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2 tablespoons olive oil, divided
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1 medium onion, thinly sliced
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1/2 teaspoon salt
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1/4 teaspoon sugar
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1/2 pound pancetta (thickly sliced), diced
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1 1/2 cups whole milk
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1/2 teaspoon dry mustard
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1/4 teaspoon freshly grated nutmeg
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2 teaspoons fresh thyme leaves
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1 cup grated Gruyère cheese, from about 4 ounces