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French Onion Soup (Soupe à l’Oignon Gratinée) Recipe

For such a simple dish, French onion soup should be easy to make great. And yet, so many versions taste like a cup of burnt-onion tea with melted cheese trying its best to cover up the flaws. This recipe develops great flavor with a long, slow caramelization of the onions, then punches it up with cider vinegar, fresh chives, and a surprise ingredient: fish sauce.

Serves 4, french, soup

  • 6 tablespoons (90g) unsalted butter, plus more for toasts
  • 1.4kg yellow or mixed onions, sliced 1/8 inch thick (see note)
  • Kosher salt and freshly ground black pepper
  • 1/2 cup (120ml) dry sherry (such as Amontillado)
  • 1.8L homemade or store-bought low-sodium chicken stock
  • 2 sprigs thyme
  • 1 bay leaf
  • 1 teaspoon (5ml) Asian fish sauce (optional)
  • 1 teaspoon (5ml) cider vinegar
  • 8 bowl-size slices rustic bread, toasted until crisp
  • 1 medium clove garlic
  • 450g Gruyère cheese, grated
  • Freshly minced chives, for garnish
  1. In a large stainless steel or cast iron saucepan, or in 2 large skillets, melt butter over medium-high heat until foaming. Add onions and cook, stirring occasionally, until softened, about 8 minutes. Lower heat to medium-low and cook, stirring frequently, until onions are very sweet and a rich golden-brown color, 1 to 2 hours. If browned onion juices on bottom of pot threaten to burn, add 1 tablespoon (15ml) water, scrape up browned bits, and continue cooking. Season with salt and pepper.
  2. Add sherry and bring to a simmer, scraping up any browned bits. (If using 2 skillets, divide sherry between them, then scrape onions and liquid from both pans into a pot or Dutch oven to continue.) Cook until alcohol smell is mostly gone, about 3 minutes. Add stock, thyme, and bay leaf; raise heat to medium-high; and bring to a simmer. Lower heat and simmer for 20 minutes.
  3. Add fish sauce, if using, and cider vinegar. Season with salt and pepper. Discard thyme sprigs and bay leaf.
  4. Preheat broiler and adjust oven rack to top position. Butter toasts and rub with garlic clove until fragrant. Spoon a small amount of broth into the bottoms of 4 ovenproof serving bowls, then top with half the toasts. Sprinkle some grated cheese on top of toasts, then spoon more soup and onions on top, nearly filling bowls. Set remaining 4 toasts in bowls, pushing to nearly submerge them. Top with remaining grated cheese and set bowls on a rimmed baking sheet. Broil until cheese is melted and browned in spots. Garnish with chives and serve.