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French Onion Soup

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French Onion Soup
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French Onion Soup

Servings

4

servings
Prep time

20

minutes
Cooking time

1

hour 
Calories

350–450

kcal

French onion soup is a classic dish from France that is known for its rich flavour, sweet caramelised onions, and melted cheese on top. It is a warm and comforting soup that many people enjoy in cold weather. The main ingredient is onions, which are slowly cooked until they become soft, sweet, and golden brown. This slow cooking process gives the soup its deep and rich taste. The soup is usually made with beef broth, which adds a strong and savoury flavour, but some versions use vegetable broth instead. One of the most famous parts of French onion soup is the topping: a slice of bread covered with melted cheese, usually Gruyère or Swiss cheese, placed on top of the soup and broiled until golden and bubbly. When you take a spoonful, you get a mix of soft onions, rich broth, crispy bread, and melted cheese all together. This combination makes it very satisfying and delicious. French onion soup is often served in restaurants, but it is also easy to make at home if you follow the steps carefully. The most important part is cooking the onions slowly so they become sweet and flavorful. This can take time, but it is worth it. The soup is also very flexible. You can adjust the seasoning, use different types of cheese, or make it lighter by using less butter. It is a great dish for dinner or as a starter for a larger meal. It feels fancy but is actually made from simple ingredients. Once you learn how to make it, you will understand why it is loved all over the world.

Ingredients

  • 6 large onions (thinly sliced)

  • 3 tablespoons butter

  • 1 tablespoon olive oil

  • 2 cloves garlic (minced, optional)

  • 6 cups beef broth (or vegetable broth)

  • 1 teaspoon sugar (optional, helps caramelise onions)

  • 1 teaspoon salt (adjust to taste)

  • ½ teaspoon black pepper

  • 1 teaspoon thyme (dried or fresh)

  • 4 slices of baguette or bread

  • 1½ cups grated Gruyère or Swiss cheese

Directions

  • Slice onions thinly.
  • Heat butter and oil in a pot.
  • Cook onions slowly until caramelised (golden brown).
  • Add garlic and cook briefly.
  • Pour in broth and season with salt, pepper, and thyme.
  • Simmer for 30 minutes.
  • Toast bread slices.
  • Pour soup into oven-safe bowls.
  • Add bread and cheese on top.
  • Broil until cheese is melted and golden.

Notes

  • Slow cooking onions is the key to good flavour. Do not rush this step.
    Use good-quality broth for the best taste.
    Gruyère cheese is traditional, but Swiss or mozzarella can also be used.
    You can make the soup ahead and reheat it before adding bread and cheese.
    Always use oven-safe bowls when broiling.
  • Q: Can I make French onion soup vegetarian?
    A: Yes, just use vegetable broth instead of beef broth.
    Q: Why are my onions not sweet enough?
    A: They may need more time to caramelise slowly. Be patient.
    Q: Can I freeze French onion soup?
    A: Yes, freeze the soup without bread and cheese. Add toppings when reheating.
    Q: What bread is best for this soup?
    A: A crusty baguette works best because it stays firm under cheese.
    Q: Can I use a different cheese?
    A: Yes, but Gruyère or Swiss cheese gives the best traditional flavour.
    French onion soup is a warm, rich, and comforting dish that turns simple ingredients into something special. It is perfect for cosy meals and special dinners alike.