INGREDIENTS
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2 tablespoons extra-virgin olive oil
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1 1/4 pounds sweet Italian sausage, casings removed, meat crumbled into small pieces
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3 shallots, peeled, halved lengthwise, and cut crosswise into 1/4-inch-thick slices
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3 pounds Swiss chard, stems removed, leaves cut crosswise into 1/4-inch strips
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3 large garlic cloves, thinly sliced crosswise
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1 tablespoon finely grated lemon zest
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1 teaspoon coarse salt
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Freshly ground pepper
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2 tablespoons fresh lemon juice
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5 tablespoons unsalted butter
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1/2 onion, cut into 1/4-inch dice
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1 1/2 teaspoons coarse salt
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1/2 teaspoon red-pepper flakes
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1/3 cup all-purpose flour
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4 1/2 cups whole milk
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Fresh Lasagna Noodles, (cut into 4-inch squares and cooked, or store-bought dried noodles, cooked and cut to size)
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8 ounces fontina cheese, grated (1 cup)