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French onion soup

From https://ruhlman.com/french-onion-soup/

Ingredients

  • 1 tbsp butter
  • 7 or 8 large Spanish onions (or 7 to 8 pounds)
  • kosher salt
  • freshly ground black pepper
  • ⅓ cup sherry (supposedly Spanish — Fina or Manzanilla)
  • red or white wine vinegar optional, as needed
  • red wine optional, to taste
  • 12 ounces Gruyère or Emmanthaler cheese, grated

Instructions

Use a large pot, with a capacity of about 7 ½ quarts/7.1 liters, that will hold all the onions. An enameled cast-iron pot will provide the best surface. Place the pot over medium heat and melt the butter. Add the onions, sprinkle with 2 teaspoons salt, cover, and cook until the onions have heated through and started to steam. Uncover, reduce the heat to low, and cook, stirring occasionally (you should be able to leave the onions alone for an hour at a stretch once they’ve released their water). Season with several grinds of pepper.

Preheat the oven to 200°F/95°C. Place the bread slices in the oven and let them dry completely (you can leave the slices in the oven indefinitely, as the heat is not high enough to burn them).

When the onions have completely cooked down, the water has cooked off, and the onions have turned amber—this will take several hours—add 6 cups/1.4 liters of water. Raise the heat to high and bring the soup to a simmer, then reduce the heat to low. Add the sherry. Taste and season with salt and pepper as needed. If the soup is too sweet, add some vinegar. If you would like a little more depth, add a splash of red wine. I like the onion-to-liquid ratio with 6 cups of water. But if you’d prefer a slightly more delicate soup, add an additional 1 cup/240 milliliters water or to taste.

Preheat the broiler (be sure you’ve removed the bread from the oven!). Portion the soup into bowls, float the bread on top, cover with the cheese, and broil until the cheese is melted and nicely browned.

Notes

This is not the original recipe we had :(

Pretty sure original recipe used beef broth and thyme but beyond that totally unsure of details. Could make this with broth and/or thyme. For the thyme especially give it 20+ minutes at the end with lid on to infuse flavor.

Wikipedia suggests it’s really usually beef broth and has a bouquet garni. Also https://en.wikibooks.org/wiki/Cookbook:Onion_Soup

I reckon you could double this if you had a big enough stock pot to begin with — the onions really reduce down and then 6 cups liquid means the final yield is not that big.

Nutrition

Estimated, per serving

  • Servings: 6
  • Serving size: 1 bowl (~1.5 cups, with bread and cheese)
  • Calories: 570
  • Protein: 26 g
  • Carbs: 69 g
  • Fat: 21 g
  • Saturated fat: 12 g
  • Fiber: 10 g
  • Total sugar: 25 g
  • Sodium: 1040 mg