Spinach Lasagna

Ingredients

• ¼ cup olive oil
• 1 small yellow onion, finely chopped
• 2 teaspoons coarse salt
• 2 pounds baby spinach
• 4 tablespoons unsalted butter
• ¼ cup all purpose flour
• 1 quart milk
• 1 packed cup grated Parmesan (3 ounces)
• ¼ teaspoon freshly grated nutmeg
• ¼ teaspoon ground black pepper
• 2 medium zucchini (about 1 pound), sliced lengthwise into ¼-inch-thick planks
• 8 ounces no-boil lasagna noodles
• 6 ounces mozzarella, shredded
• ⅓ packed cup (1 ounce) grated Pecorino Romano

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