INGREDIENTS
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For filling
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1 large onion, chopped
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3 tablespoons unsalted butter
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3 lb butternut squash, peeled, seeded, and cut into 1/2 pieces (just look for those pre-cut packages in produce)
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1 teaspoon minced garlic
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1 teaspoon salt
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1/4 teaspoon white pepper
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2 tablespoons chopped flat-leaf parsley
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4 teaspoons chopped fresh sage
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1 cup hazelnuts (4 ounces), loose skins rubbed off with a kitchen towel, and coarsely chopped
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For sauce
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1 teaspoon minced garlic
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3 tablespoons unsalted butter
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5 tablespoons all-purpose flour
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5 cups milk
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1 bay leaf
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1 teaspoon salt
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1/8 teaspoon white pepper
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For lasagna assembling
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1/2 lb fresh mozzarella, grated (2 cups)
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1 cup finely grated Parmigiano-Reggiano (3 ounces)
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12 sheets no-boil lasagna (1/2 lb)