French onion soup is a timeless Parisian classic known for its rich caramelized onion base and bubbling cheese topping. Originally a humble peasant dish, it became a staple in French bistros and is now beloved worldwide.
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Preparation
30 min.
Cooking
75 min.
Тotal
105 min.
Servings
4
Authentic French onion soup with caramelized onions, rich broth, toasted bread and melted cheese. A classic French comfort dish with deep flavor and a golden gratin topping.
In a deep pot, the butter and olive oil are heated together. The thinly sliced onions are added and slowly cooked over low heat for about 30 minutes, until deeply golden and caramelized.
The flour is sprinkled over the onions and stirred for 1-2 minutes.
The wine is poured in and allowed to reduce briefly. The broth, thyme, bay leaf, salt and black pepper are added. The soup is simmered gently for about 30 minutes.
Meanwhile, the bread slices are toasted in the oven or toaster until golden. Grated cheese is placed on top of each slice.
The French onion soup is ladled into ovenproof bowls.
One or two toasted bread slices with cheese are placed on top. The bowls are transferred to the oven and broiled for 5-10 minutes, until the cheese melts and turns golden brown.
Authentic French onion soup is made with slowly caramelized onions cooked in butter, simmered in rich broth and served with toasted bread and melted cheese on top.
Why are the onions cooked for a long time?
Slow cooking allows the onions to caramelize and release their natural sweetness, which creates the deep flavor that defines this classic soup.
What is the best cheese for French onion soup?
Gruyère is the traditional choice because it melts beautifully and adds a nutty flavor, but Emmental or Swiss cheese are also commonly used.
Can French onion soup be made without wine?
Yes. While wine adds depth to the broth, the soup can still be delicious when made only with good-quality stock.
Can I prepare French onion soup in advance?
Yes. The soup base can be prepared a day ahead and stored in the refrigerator. The bread and cheese topping are best added just before serving.
Why is bread added on top of the soup?
The toasted bread absorbs the flavorful broth and supports the melted cheese layer, creating the classic gratin topping.
Can French onion soup be frozen?
Yes. The soup base freezes well for up to three months, but it is best to add the bread and cheese only when reheating and serving.
What onions work best for this soup?
Yellow onions are the most traditional choice because they develop a rich flavor when caramelized.
Is French onion soup served as a main dish or starter?
It is traditionally served as a starter, but a larger portion can easily work as a comforting main meal.
In the US, it’s often served as a hearty starter in steakhouses, while in the UK it’s a comforting winter favorite. The key to its depth of flavor lies in slowly caramelizing the onions - patience makes all the difference.
Serve it with crusty bread and a glass of white wine for a true French dining experience at home.
