This French Onion Soup recipe is a labor of love, requiring slow cooking to bring out the deep, caramelized flavors of the onions. Perfect for a crowd, this recipe serves 18 and is a comforting classic. The combination of rich broth, wine, and gooey Swiss cheese makes it a dish to remember. Whether you broil the bread and cheese separately or directly in oven-safe bowls, the result is always satisfying.
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Cook onions, butter, and 1 teaspoon of salt in a crockpot on low for 8-10 hours. Stir occasionally to ensure consistent cooking.
Once softened and browned, transfer the onions to a large stock pot.
Add white wine to the stock pot and cook for about 5 minutes to allow it to reduce.
Add beef broth, Worcestershire sauce, garlic, 3 teaspoons of salt, and black pepper. Bring the mixture to a simmer, then turn the heat to low and continue to simmer for 35-45 minutes.
Broil sourdough bread with Swiss cheese on top until the cheese is bubbly and brown.
Alternatively, ladle cooked soup into oven-safe bowls, top with bread and cheese, and broil for 2-3 minutes until the cheese is melted and bubbly.
Serve the soup hot with the bread and cheese topping. Enjoy!
Stir the onions occasionally while cooking in the crockpot to ensure even caramelization.
For more cheese coverage, grate the Swiss cheese instead of slicing it.
Use oven-safe bowls for a more traditional presentation and to keep the bread and cheese warm.
Can I use chicken broth instead of beef broth?
Yes, you can use half chicken broth and half beef broth for a lighter flavor.
Can I make this recipe ahead of time?
Yes, you can prepare the soup ahead of time and reheat it before serving. Broil the bread and cheese topping just before serving.
What type of wine should I use?
A dry white wine, such as Sauvignon Blanc or Chardonnay, works best for this recipe.
Can I use a different type of cheese?
Yes, Gruyère or mozzarella can be used as alternatives to Swiss cheese.
How do I store leftovers?
Store leftover soup in an airtight container in the refrigerator for up to 3 days. Reheat on the stovetop before serving.
