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.)

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 is my French onion soup too sweet? ›

Onions are very sweet, especially when they're cooked down, and that is the main purpose of onion soup. The sweetness can be balanced by adding some dry wine or vinegar. Taste as you go and don't overdo it. A little salt will balance it too, but don't forget that the grated cheese you will top it with is salty.

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.

What is the best wine to use in 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.

How do you thicken French onion soup? ›

If you want to thicken your French onion soup, you can add a bit of flour. Combine a couple of tablespoons of flour with a teaspoon of salt and whisk in about a quarter cup of water. Bring the mixture to a boil, then reduce the heat and simmer for about 10 minutes, until thickened.

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.

Should you caramelize onions for French onion soup? ›

The key to good French onion soup is to cook the onions so long that they threaten to melt into a viscous, dark brown paste, à la Marmite. As has already been extensively reported in Slate, there are no shortcuts when you're caramelizing onions; it always takes at least an hour, usually longer.

Why does my French onion soup taste burnt? ›

If the heat is too high, the onions will burn. If you don't stir often at beginning and almost constantly toward the end, the onions will burn. If one little bit burns the whole batch needs to be tossed. Otherwise the soup ends up tasting like burnt onion.

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 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.

How do you get the depth of flavor 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.

How do you add acid to French onion soup? ›

The acidity of wine helps balance the rich, sweet flavors of caramelized onions and beef broth in this classic soup. Replacing it with an acid such as apple cider vinegar or lemon juice can help fill the gap. Try adding a splash of vinegar or citrus juice at the end of cooking and adjust to taste.

Top Articles
Latest Posts
Article information

Author: Mr. See Jast

Last Updated:

Views: 6024

Rating: 4.4 / 5 (55 voted)

Reviews: 86% of readers found this page helpful

Author information

Name: Mr. See Jast

Birthday: 1999-07-30

Address: 8409 Megan Mountain, New Mathew, MT 44997-8193

Phone: +5023589614038

Job: Chief Executive

Hobby: Leather crafting, Flag Football, Candle making, Flying, Poi, Gunsmithing, Swimming

Introduction: My name is Mr. See Jast, I am a open, jolly, gorgeous, courageous, inexpensive, friendly, homely person who loves writing and wants to share my knowledge and understanding with you.