Ingredients

  • Two heads of cauliflower (6 1/2 pounds total), cored
  • 2 cups dry Champagne
  • 2 cups chicken stock or low-sodium broth
  • 3 garlic cloves, lightly smashed
  • 2 large thyme sprigs
  • Salt and freshly ground white pepper
  • 2 tablespoons unsalted butter
  • 1/4 cup all-purpose flour
  • 1 cup whole milk
  • 1/2 pound Gruyere cheese, shredded

Method

  • Preheat the oven to 400.
  • Set the heads of cauliflower in a 10-by-16-inch glass or ceramic baking dish.
  • Add the Champagne, stock, garlic and thyme to the baking dish and season the cauliflower with salt and white pepper.
  • Cover with foil and roast for 1 hour and 40 minutes, or until tender, basting with the pan juices every 30 minutes.
  • Preheat the broiler.
  • Broil the cauliflower for 5 minutes, or until golden brown, shifting the dish as necessary.
  • Strain the pan juices and reserve 2 cups.
  • Keep the cauliflower warm.
  • Melt the butter in a large saucepan.
  • Add the flour and whisk over moderate heat for 1 minute.
  • Whisk in the 2 cups of pan juices and the milk; whisk until smooth.
  • Add the cheese and cook, whisking frequently, until the sauce is thickened, 5 minutes.
  • Season with salt and white pepper.
  • Pour the sauce over the cauliflower and serve.