"The steakhouse side dish becomes your weeknight main dish...."
INGREDIENTS
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1/2 lb dried spaghetti, rotelle, fusilli, campanelle, or rigatoni
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4 tablespoons unsalted butter
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1 small onion, finely diced
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2 garlic cloves, minced
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3 tablespoons all-purpose flour
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2 cups whole milk
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1/2 teaspoon ground nutmeg
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1/8 teaspoon cayenne powder
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1 small package (250 grams) frozen defrosted and drained, or 8 cups fresh spinach
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Kosher salt and freshly cracked black pepper, to taste