INGREDIENTS
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3/4 head of cauliflower, cut into large florets
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3/4 lb of brussels sprouts, trimmed, and quartered lengthwise through core
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1 teaspoon of kosher salt
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4 tablespoons (1/2 stick) unsalted butter, divided
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3 tablespoons all-purpose flour
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2 cups hot milk
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1/2 teaspoon freshly ground black pepper
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a pinch of grated nutmeg
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3/4 cup grated Gruyere cheese, divided
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1/2 cup grated Parmesan cheese
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1/4 cup fresh bread crumbs