INGREDIENTS
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2 pounds medium zucchini
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Kosher salt
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1 stick unsalted butter
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1/4 cup all-purpose flour
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1/2 teaspoon freshly grated nutmeg
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Pinch of cayenne pepper
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Freshly ground black pepper
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6 cups whole milk
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4 sprigs fresh thyme
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3 bay leaves
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Grated zest of 1/2 lemon
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1 pound medium pasta shells
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4 shallots, minced
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2 large egg yolks, lightly beaten
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4 ounces parmesan cheese, grated (about 1 cup)
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4 ounces gruyere cheese, grated (about 1 1/4 cups)
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4 ounces baby spinach