Classic French Onion Soup

This is a classic French onion soup recipe that is perfect for a winter meal. It is simple to make and can be easily adapted to your own taste. The soup can be served with some crusty bread and cheese, or with some croutons and a salad. It is also a great way to use up any leftover onions that you may have. This soup is also suitable for vegetarians and vegans.


  • 1 tablespoon olive oil
  • 1 kg onions, sliced
  • 1 teaspoon sugar
  • 2 cloves garlic, minced
  • 1 litre vegetable stock
  • 1 tablespoon cornflour
  • Salt and pepper to taste
  • Optional: 1-2 tablespoons brandy or red wine


Heat the olive oil in a large soup pot over medium heat. Add the onions and sugar, and cook until the onions are golden brown, stirring occasionally. This will take about 15-20 minutes.

Add the garlic and cook for a minute longer. Add the vegetable stock and bring to a boil. Reduce the heat and simmer for 10 minutes.

In a small bowl, mix together the cornflour and some of the soup liquid. Add this back into the soup and stir until thickened. Season with salt and pepper to taste.

If using, add the brandy or red wine and simmer for a few more minutes. Serve hot with some crusty bread and cheese, or croutons and a salad.

Potential changes & improvements

There are many potential changes and improvements that can be made to this recipe. For example, you could add some other vegetables such as carrots or celery. You could also add some different herbs and spices to the soup, such as thyme or rosemary. If you want a more substantial soup, you could add some cooked rice or pasta. For a vegan version of this soup, you could use a vegan stock and omit the cheese.

What other food it works well with

This soup goes well with a variety of other foods. For example, it can be served with some crusty bread and cheese, or with some croutons and a salad. It also goes well with a variety of other soups and stews.

Common Mistakes

One common mistake when making this soup is to not cook the onions long enough. This can result in a soup that is too watery and not as flavourful. Another common mistake is to add too much stock, which can make the soup too thin. It is important to add just enough stock to cover the onions and garlic. Lastly, be careful not to overcook the garlic, as this can make it taste bitter.

Nutritional Information

This soup is high in dietary fibre and vitamin C. It is also low in calories and fat. This soup is suitable for vegetarians and vegans.


This soup contains onions and garlic. It may also contain traces of other allergens, depending on the stock that is used.

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