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.

What is the difference between onion soup and French 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.

What broth is French onion soup made of? ›

This soup traditionally is made with beef stock, though sometimes a good beef stock can be hard to come by and expensive to make. If you use boxed stock, taste it first! If you don't like the taste, don't use it. (If you cook a lot of beef or beef roasts, save the scraps and freeze them to make a stock with later.)

What is the best wine to use for French onion soup? ›

Wine is optional to deglaze the pan and add flavour to the soup. I recommend a dry white or red wine, such as a good quality Pinot Grigio/Gris, Sauv Blanc, Sémillon, Chardonnay, Merlot or Pinot Noir. Generally, if you can't drink it, don't cook with it.

Why is my French onion soup so bland? ›

If you don't add enough salt, pepper, or other herbs and spices, the soup may taste bland.

How can I make my French onion soup better? ›

If you want your French Onion Soup to have the absolute best flavor, follow these tips:
  1. Don't rush through caramelizing the onions. Cook them low and slow until they become dark brown and jammy in texture (see reference photos below). ...
  2. Use a good quality beef broth. ...
  3. Use good bread. ...
  4. Don't use pre-shredded cheese.
Nov 28, 2020

Why is French onion soup so expensive? ›

First, French onion soup calls for a ton of onions. While onions aren't expensive, there's a lot of labor involved in halving, peeling, and slicing 10, 12, 50, or one billion onions (I don't know how much soup you make).

Why does French onion soup taste so good? ›

French onion soup is the ultimate comfort food. Onions get slowly cooked until sweet and caramelized, then simmered in rich broth until they're practically falling apart. To finish it off, toasted bread is added to give it that lovable crisp-gone-soggy texture and a generous amount of Gruyère cheese is melted on top.

Should French onion soup be thick or thin? ›

Is French onion soup supposed to be thick or thin? You want this to be slightly thicker than a broth soup but nowhere near as thick as a chowder. Adding a roux gives it just enough body for the broth to adhere to the onions, so you get a spoonful in every bite.

Is chicken stock or beef stock better for French onion soup? ›

Beef Bone Broth: A high-quality beef broth makes all the difference in this Easy French Onion Soup. For best results, I recommend using beef bone broth, though chicken bone broth would work as well. Not only does bone broth have a deeper flavour, it is also high in collagen and nutrients that are great for gut health.

What alcohol is good in French onion soup? ›

Brandy really just helps to concentrate all of the flavors together and works to bring out the flavors present in the herbs and the onions,” says Jonathan Pacheco, head chef at Café Paulette.

What is Panera French onion soup made of? ›

Sweet caramelized onions in a savory broth with a sherry wine vinegar gastrique, sea salt, topped with cheese and black pepper and sea salt croutons.

What type of bowl is best for French onion soup? ›

French onion soup is traditionally served in lionhead bowls, which are deep but not very wide porcelain bowls. Here are four reasons why these bowls are perfect: Plenty of soup. Even as the bread on top starts to soak up some of the soup, there's still plenty left underneath.

What can I use instead of sherry in French onion soup? ›

You can use a white wine, brandy or dry vermouth (or, depending on the recipe, red wine, Port, Madeira or Marsala, knowing they will leave some residual flavor). You can also try vinegars—apple cider, wine vinegar or even rice wine vinegar.

What can I use instead of cognac in French onion soup? ›

What can be used instead of cognac in a recipe? Brandy, armagnac, calvados, rum, sherry, whiskey and bourbon. Non-alcoholic options are white grape juice and apple juice. Check out the list above for more details for ratios and different applications.

How to make French onion soup less bland? ›

Why does my French onion soup taste bland? To improve the blandness of your French onion soup: add more seasoning, caramelize onions longer than usual, use high-quality beef broth, simmer for extended time and include melted cheese with crouton as toppings for added richness.

How to doctor up canned French onion soup? ›

Some fresh rosemary or thyme brings a woody, peppery taste to the soup, complementing the umami flavor of the beef stock. With a splash of balsamic vinegar and green onions or fresh basil as a garnish, the canned soup is transformed from a grocery store original into a gourmet dish.

How do you add depth of flavor to soup? ›

"If your broth is lacking in savory richness, try adding roasted onion, tomato paste, mushrooms, seaweed, soy sauce, or miso. These ingredients add umami flavor and depth to broth," she says. The choice of ingredient depends on the recipe, though.

How do you make soup taste stronger? ›

You can extract a clean, strong broth from a combination of water and several pantry ingredients. It's all about layering powerful flavor-enhancers that you probably already have on hand—bacon, tomato paste, herbs, peppercorns, a Parmesan rind, and, of course, kosher salt.

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