French onion soup in two bowls with onions

French onion soup

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(69 ratings)

Prep: 15 mins Cook: 55 mins


Serves 4

A deeply savoury soup to use up a garden glut, make sure you caramelise your onions so they're really rich and tender

Nutrition and extra info

  • soup only

Nutrition: per serving

  • kcal618
  • fat27g
  • saturates14g
  • carbs59g
  • sugars17g
  • fibre9g
  • protein26g
  • salt2.6g
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  • 50g butter



    Butter is a dairy product made from separating whole milk or cream into fat and…

  • 1 tbsp olive oil
    olive oil

    Olive oil

    ol-iv oyl

    Probably the most widely-used oil in cooking, olive oil is pressed from fresh olives. It's…

  • 1kg onion, halved and thinly sliced



    Onions are endlessly versatile and an essential ingredient in countless recipes. Native to Asia…

  • 1 tsp sugar



    Honey and syrups made from concentrated fruit juice were the earliest known sweeteners. Today,…

  • 4 garlic cloves, thinly sliced
  • 2 tbsp plain flour
  • 250ml dry white wine
  • 1.3l hot strongly-flavoured beef stock
  • 4-8 slices French bread (depending on size)
  • 140g gruyère, finely grated



    Gruyère is an undoubted pinnacle of traditional Swiss cheese-making, a culinary masterpiece as…


  1. Melt 50g butter with 1 tbsp olive oil in a large heavy-based pan. Add 1kg halved and thinly sliced onions and fry with the lid on for 10 mins until soft. 

  2. Sprinkle in 1 tsp sugar and cook for 20 mins more, stirring frequently, until caramelised. The onions should be really golden, full of flavour and soft when pinched between your fingers. Take care towards the end to ensure that they don’t burn.

  3. Add 4 thinly sliced garlic cloves for the final few mins of the onions’ cooking time, then sprinkle in 2 tbsp plain flour and stir well.

  4. Increase the heat and keep stirring as you gradually add 250ml dry white wine, followed by 1.3l hot strongly-flavoured beef stock. Cover and simmer for 15-20 mins.

  5. To serve, turn on the grill, and toast 4-8 slices French bread. Ladle the soup into heatproof bowls.

  6. Put a slice or two of toast on top of the bowls of soup, and pile on 140g finely grated gruyère cheese. Grill until melted. Alternatively, you can complete the toasts under the grill, then serve them on top.

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Comments, questions and tips

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16th Apr, 2017
Well, I don't know what I did wrong but it was just a saucepan full of sugar-water amid a kilo of wasted onions. That was until I added another stock cube, Worcester sauce an a pinch of cayenne pepper, and that was just to make it barely edible! I followed the recipe but it's very hard to caramelise onions with the lid on. They just steam.
Mandy Bea
24th Oct, 2016
I have just made this soup and it was so tasty will be making it again. I topped it with bread but I didn't have the right cheese but the cheese I used worked just as good
jburton's picture
18th Apr, 2016
I'm going to make this using my spiralizer should cut down the onion prep to practially nothing
18th Oct, 2016
Oh dear. It takes seconds to slice onions. You will end up with water.
3rd Dec, 2015
Made this today, it was relatively straight forward and went down a treat. If i wanted to double the quantity is it as simple as just doubling the whole recipe/ingredients? Or would it be more selective doubling?
22nd Nov, 2015
Great recipe. Followed it to a tee.
11th Nov, 2015
Made this exactly as per recipe. Utterly divine. I toast the cheesy french bread crutons under the grill and then float on top of the soup bowls as I think it is too dangerous to grill a full soup bowl at eye height and just not necessary, it adds nothing to the dish to do it that way. It does take a while to carmelize the onions and looks like an alarming amount in the pan until they all melt into golden wonderfullness.
4th Jul, 2015
Does this keep? Can it be chilled and kept in the fridge or frozen and kept for longer?
23rd Jun, 2015
This soup takes a while to make, but it's easy, and tastes delicious. Give it a go!
17th Dec, 2014
I made this using 3 Tesco beef stock cubes as they were the only ones I could find suitable for coeliacs, unfortunately they gave a different flavour to what I was aiming for. I'll try it again with veg stock and if I'm still not happy my niece will have to do without and I'll make it with a good quality beef stock pot. This is for the starter for Christmas Day dinner.


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