French Onion Soup

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A rich and hearty French onion soup with bone marrow, caramelized onions, and a cheesy topping.

01:30:00 total

Serves 4

medium

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Ingredients

  1. bone marrow bones - 2 (for roasting)
  2. onions - 6 (sliced)
  3. butter - 3 tablespoons (unsalted)
  4. beef broth - 6 cups (or bone broth)
  5. baguette - 1 (for toasts)
  6. Gruyère cheese - 8 ounces (shredded)
  7. Parmesan cheese - 1/4 cup (for topping)
  8. brandy - 2 tablespoons (or Calvados)
  9. fish sauce - 1 tablespoon (for umami)
  10. Worcestershire sauce - 1 tablespoon (for flavor)
  11. soy sauce - 1 tablespoon (for seasoning)
  12. tomato paste - 2 teaspoons (optional)
  13. bay leaf - 1 (for bouquet garni)
  14. fresh thyme - 2 sprigs (for bouquet garni)
  15. fresh parsley - 2 sprigs (for bouquet garni)
  16. garlic - 1 clove (fresh, grated)
  17. salt - watch the video to see (to taste)
  18. pepper - watch the video to see (to taste)

Instructions

  1. Prepare the Bone Marrow: Brine the marrow bones and roast them in a preheated oven at 400°F for 20 minutes.
  2. Slice the Onions: Slice the onions in half and then into thin slices.
  3. Caramelize the Onions: Melt butter in a large pot over medium heat, add onions, and cook until caramelized, about 30-40 minutes.
  4. Make the Soup Base: Add flour and tomato paste to the caramelized onions, stir to combine, and cook for a few minutes.
  5. Deglaze the Pot: Add brandy to deglaze the pot, scraping up any browned bits.
  6. Add Broth and Seasonings: Pour in the beef broth, add fish sauce, Worcestershire sauce, soy sauce, and bay leaf. Simmer for 30 minutes.
  7. Prepare the Toasts: Slice the baguette and toast it in the oven until golden brown.
  8. Assemble the Soup: Ladle soup into crocks, top with toasted baguette slices, and cover generously with Gruyère and Parmesan cheese.
  9. Broil the Soup: Place the crocks under the broiler until the cheese is bubbly and golden brown.
  10. Serve: Garnish with chopped chives and serve hot.

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