- 4 tablespoons (1/2 stick) unsalted butter
- 4 cups chopped yellow onions (2 large)
- 1/4 cup flour
- 1/4 teaspoon grated nutmeg
- 1 cup heavy cream
- 2 cups milk
- 3 pounds frozen chopped spinach, defrosted (5 (10-ounce) packages)
- 1 cup freshly grated Parmesan cheese
- 1 tablespoon kosher salt
- 1/2 teaspoon freshly ground black pepper
- 1/2 cup grated Gruyere cheese
Preheat the oven to 425 degrees F.
Melt the butter in a heavy-bottomed saute pan over medium heat. Add the onions and saute until translucent, about 15 minutes. Add the flour and nutmeg and cook, stirring, for 2 more minutes. Add the cream and milk and cook until thickened. Squeeze as much liquid as possible from the spinach and add the spinach to the sauce. Add 1/2 cup of the Parmesan cheese and mix well. Season, to taste, with salt and pepper.
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