How to make French onion soup - recipe | Felicity Cloake's masterclass (2024)

Though there are, of course, other onion soups (Iranian eshkeneh, for example, or Tuscan carabaccia), none has quite captured the international imagination like the “French” variety, said to have originated in the markets of Paris, where the rich, savoury broth fuelled early traders and late-night revellers alike. The accompanying mountain of molten cheese is optional, but strongly recommended.

Prep 15 min
Cook 2 hr 45 min
Serves 4 as a starter, 2 as a meal

4 onions
80g butter
, plus 2 tbsp extra for the toasts
3 sprigs thyme
1 tbsp plain flour
1 tbsp balsamic vinegar
400ml medium cider
600ml good-quality stock
, preferably beef
½ baguette
1 garlic clove
100g gruyère or
emmental
1 dash
calvados or other brandy

1 Prepare the onions

Start by peeling and slicing the onions as thinly as possible; if you have one, a mandoline will make this task immeasurably easier and quicker. Note that, though pink Roscoff onions are the ideal here, ordinary yellow ones are fine; though I find white ones lack bite and red ones a bit too sweet, they, too, will work well enough.

2 Brown the onions

How to make French onion soup - recipe | Felicity Cloake's masterclass (2)

Melt the butter in a large, heavy-based frying pan on a medium-low heat. Add the onions, season, stir to coat with the fat, then turn down the heat and leave them to cook, stirring regularly, until a very deep, golden brown colour – you can turn up the heat a little once they’ve softened, but be very careful they don’t burn.

3 Keep browning the onions

Be warned that it will take at least an hour, and possibly more like two, to brown the onions sufficiently; don’t be tempted to rush it, or you’ll end up with bland or bitter soup, depending on whether you under- or overcook them. If you can’t stir them regularly, you may prefer to put them in an 180C (160Cfan)/350F/gas 4 oven for three hours instead.

4 Add the herbs and flour

Pick the leaves from the thyme and add to the pan with the flour (substitute cornflour if you need to keep the soup gluten-free).

Stir until well distributed, cook for another two minutes, then add the vinegar and a little of the cider, and scrape the bottom of the pan to dislodge any bits stuck to the base.

5 Add the cider and stock

How to make French onion soup - recipe | Felicity Cloake's masterclass (4)

Pour in the remaining cider, stirring as you do so, then add the stock. Beef stock is traditional here, and my own preference, because I find it has a depth of savoury flavour that other stocks struggle to match, and works particularly well with the sweetness of onions. Use good chicken or vegetable stock, if you prefer, or even water with a hefty spoonful of Marmite or miso paste to give it some oomph.

6 Simmer for an hour

Turn up the heat and bring the contents of the pan up to a simmer, then reduce it slightly and leave the soup to bubble away gently for about an hour, stirring occasionally to prevent the onions sticking. Towards the end of the cooking time, if you’re planning to eat the soup immediately, start preparing the croutons.

7 Make the croutons

How to make French onion soup - recipe | Felicity Cloake's masterclass (5)

Cut eight thin slices from the baguette and melt a couple of tablespoons of butter in a small pan (or in the microwave).

Heat the grill and put the bread slices on a baking tray. Cut the garlic cloves in half and run the cut side over the bread, then brush the bread with melted butter. Grill until golden, then turn over to toast the other side. Remove the bread, and leave the grill on.

8 Now for the cheese

How to make French onion soup - recipe | Felicity Cloake's masterclass (6)

Grate the cheese; the nutty flavour of gruyère is my favourite here, but emmental, cheddar or anything with good melting capabilities will work.

Add the brandy to the soup, and check and adjust the seasoning, if necessary. Ladle into ovenproof bowls and top each with two croutons and a mound of cheese. Grill until the cheese is molten and bubbling, and serve at once.

9 Finishing touches

If you get to step 8 and find your soup lacks a certain something, even after you’ve adjusted the seasoning (which can happen if your onions or stock are deficient in the flavour department), try stirring in an umami-rich ingredient such as Marmite, Bovril, miso paste or fish sauce, then taste and add more as necessary, until it hits the spot.

How to make French onion soup - recipe | Felicity Cloake's masterclass (2024)

FAQs

How do you deepen the flavor of French onion soup? ›

A few sprigs of thyme and a bay leaf elevate the soup even more, but I take it a step further, adding a splash of fish sauce for complexity and depth—don't worry, it won't taste fishy—and a hit of cider vinegar to balance some of that oniony sweetness.

Why add flour to French onion soup? ›

Onion soup, at its very essence, is nothing more than onions and water boiled together. Period, done, finished, everything added from that point on is pure opinion. Caramelizing the onions brings out sugars, and makes a more luxurious silky and sweet soup, adding flour gently thickens and provides body.

Why do you put baking soda in French onion soup? ›

The caramelized onions for this soup cook more quickly due to a pinch of baking soda but still have that deep, slow-cooked flavor.

How to make French onion soup less bland? ›

  1. Start by reducing the broth.
  2. Simmering out some water will intensify the flavor of the broth. Once you get it to the right point, add some salt.
  3. A shot of brandy at the end helps too.
Sep 3, 2021

What spices add depth to soup? ›

"Ground paprika, turmeric, nutmeg, ground ginger, and other powdered spices add a touch of color and spiciness to broths," she says. As a general rule, use fresh herbs at or near the end of cooking and dried herbs and spices early on. This helps you get the flavors you're looking for in the right balance.

How do you make soup taste richer? ›

Go Bold. A punch of flavor at the end of cooking can make your soup a standout. Mix herbs like parsley, thyme, and oregano, or spices such as cumin, coriander, and cardamom, into some olive oil, and let it infuse for at least an hour or two. Pour it over soup just before serving.

What is the difference between French onion soup and onion soup? ›

What is the Difference Between Onion Soup and French Onion Soup? French onion soup is always made with beef stock. Other onion soups can be made with chicken, vegetable, or beef stock. Additionally, French onion soup typically contains wine or sherry, which isn't typical or necessary in other onion soups.

How to thicken up French onion soup? ›

The easiest way to thicken your French onion soup is with flour. You can also use cornstarch if you don't have any flour. Remember to never add the flour or cornstarch directly to the soup – otherwise you run the risk of it clumping.

Why is my French onion soup watery? ›

Sometimes soup just needs to simmer longer to reach the perfect consistency. Check to see if the vegetables are tender, and then taste the broth. If the soup tastes a bit watery, give it more time.

Why is my French onion soup sour? ›

It might be because of the stock or that you used onions that has sour flavor such as white onions. To solve this problem u might have to mixed the onions with other kind of onions. My suggestion is to mix in yellow onions and red onions that have more sugar content.

Why does my French onion soup taste bitter? ›

Burned onions – result in bitter soup. Be careful to not burn the onions/cook them until they are too dark in color – you don't really need to cook them until they are dark brown – golden brown/light brown is enough.

Why do you put lemon juice in soup? ›

In this case, however, the lemon provides more of a flavor undertone that enhances other seasonings like thyme, parsley, and turmeric. According to trained chef Leetal Arazi, who spoke with Real Simple, you can bring a "zesty flavor" to your soup simply by adding lemon.

How do you counteract sweetness in French onion soup? ›

Raise the heat to high and bring the soup to a simmer, then reduce the heat to low. Add the sherry. Taste and season with salt and pepper as needed. If the soup is too sweet, add some vinegar.

How to keep cheese from sinking in French onion soup? ›

After adding the cheese and bread, broil the soup in the oven to help create a golden and bubbly crust on the cheese, preventing it from sinking.

Can I use chicken broth instead of beef broth in French onion soup? ›

It is better to use chicken or vegetable broth rather than sub-standard beef broth. Best to use low salt and add salt if required. 4. Bread - The idea with the recipe is that you can use a spoon to cut through the bread into the soup to eat it (see video).

How to doctor up canned French onion soup? ›

Infusing the soup with a richer taste is as easy as quickly sauteing crushed garlic before pouring the soup in. Some soft, buttery garlic sauteed in earthy olive oil is the perfect addition to enrich canned French onion soup.

How do you get the depth of flavor in vegetable soup? ›

You could add red pepper chili flakes, cayenne, Herbs de Provence or curry powder for more flavors. The caramelized onions add a lot of depth to the soup but you could also add in tomato paste or even miso or soy sauce.

How do you get the depth of Flavour in vegetable soup? ›

A squeeze of citrus, a dollop of yogurt or a drizzle of cream, a dusting of cheese or a good chile powder, a sprinkling of some herbs or croutons — all can take a perfectly fine soup into the realm of the delectable. Even a spiral of good olive oil to finish and some coarse sea salt can do wonders.

References

Top Articles
Latest Posts
Article information

Author: Ms. Lucile Johns

Last Updated:

Views: 5622

Rating: 4 / 5 (61 voted)

Reviews: 92% of readers found this page helpful

Author information

Name: Ms. Lucile Johns

Birthday: 1999-11-16

Address: Suite 237 56046 Walsh Coves, West Enid, VT 46557

Phone: +59115435987187

Job: Education Supervisor

Hobby: Genealogy, Stone skipping, Skydiving, Nordic skating, Couponing, Coloring, Gardening

Introduction: My name is Ms. Lucile Johns, I am a successful, friendly, friendly, homely, adventurous, handsome, delightful person who loves writing and wants to share my knowledge and understanding with you.