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? ›

My personal go-tos include worcestershire sauce, fish sauce, and brandy. Each deepens the flavor of french onion soup. Balsamic vinegar and soy sauce are other great options.

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.)

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. Topping the soup with hot, cheesy toasts prepared while the soup simmers, eliminates the need to bake the soup in specialty French onion soup bowls.

What can I add to soup for depth of flavor? ›

"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.

What spices add depth to soup? ›

Herbs and sources add flavor, aroma, and intensity to the soup broth. You can pick fresh or dried herbs like basil for tomato-based soups or fresh parsley for clear broths. You may also add more spices like turmeric, ground ginger, ground paprika, or nutmeg for a touch of spice and color to your soup broth.

Why did Panera change their French onion soup? ›

Panera Bread is working to regain customers' loyalty in 2020 with the reintroduction of its fan-favorite French Onion Soup. 2019 was a year of food news for Panera, not all of it positive. First, it removed the French Onion Soup, a staple on the menu for over 20 years, to make room for seasonal menu items in June.

Why is French onion soup 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.

Does it matter how you cut onions for French onion soup? ›

For French onion soup, it is best to slice the onions into thin, even slices. This will allow them to cook evenly and caramelize properly. You can achieve this by cutting the onion in half, placing the flat side down, and slicing it widthwise into thin slices.

What wine is best 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 does French onion soup have bread in it? ›

Some form of bread will accompany most French onion soups. Usually, you'll find crispy croutons atop the soup. Croutons or toasted bread can also be layered into the soup to prevent the melted cheese on top from sinking.

Why is my French onion soup watery? ›

Traditionally, French onion soup is made with clear beef stock. If you want a rich (thick) stock, you start with a joint bone. One with lots of connective tissue. You brown this in the oven, then put it in a pot, cover with water, and simmer till all the connective tissue dissolves.

Should onions be caramelized for French onion soup? ›

Caramelizing the onions slowly in butter until they're rich golden brown (but not so dark as to taste bitter) produces the sweetest, most flavorful results. If you don't have homemade beef stock, the recipe's suggested homemade or store-bought chicken stock substitutions are better than most store-bought beef stock.

How do you thicken 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.

Is French onion soup good for you? ›

Well, you'll be pleased to know that french onion soup is, in fact, a highly nutritious choice. Onions, as part of the Allium family, contain Quercetin which is a powerful anti-inflammatory and should not be overlooked as a vegetable when considering your daily 7-a-day.

How do you 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 make soup taste stronger? ›

Use fresh vegetables, high-quality meats or broth, and fresh herbs to add depth of flavor. Add acidity: A squeeze of lemon or lime juice, a dash of vinegar, or a splash of wine can brighten the flavors of a soup and make it taste more complex.

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