French Onion Soup (2024)

French Onion Soup is essentially caramelised onion in soup form topped with cheesy bread. The French are genius!

Caramelising onions calls for patience, but it’s worth it. You’ll be rewarded with deeply golden, intensely sweet onions that forms an incredible flavour base for this French Onion Soup. For an effortless option, see how to caramelise onions in aslow cooker!

French Onion Soup (1)

THE ICONIC FRENCH ONION SOUP!

French Onion Soup is probably one of the most epic soups in this whole wide world. And yet, the soup itself is made with very few core ingredients: butter, onions, flour and stock/broth.

The magic is in the caramelisation of the onions, cooked slowly for at least 40 minutes.And of course the crowning glory – the glorious melted cheese toast!! Because let’s face it – French Onion Soup without the cheesy toast isjust onion soup.Meh!

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CARAMELISED ONIONS – STOVE OR SLOW COOKER

The caramelised onions are the star of the soup (well, on par with the cheesy toast). Making caramelised onions the classic way on the stove takes upwards of 45 minutes for a giant mound like we use for French Onion Soup.

It’s not high-stress or high-energy effort. For most of the time, the onions are cooked over low heat so you just need to stir themevery now and then.

It’s the sort of thing that’s good to make while pottering around the kitchen doing other things.My cast iron pot is 24 cm / 10″ wide and it was full to the brim with raw onions and took almost an hour to caramelise. If you have a wider base pot, it will be faster – probably closer to 45 minutes.

Though of course, if this all seems like too much effort for you…… introducing….

SLOW COOKER CARAMELIZED ONIONS!!!

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Yes. You. Can!!!

I first learned of this from a reader then found this recipe on TheKitchn. Terrifically convenient and totally hands off, just throw the onions in, drizzle with butter or oil then leave on low for 10 hours.

This will get you 75% of the way there. The onions are browned a bit but lack the same intensity of flavour you get from caramelising on the stove.

So you do still need to cook the onions on the stove for 10 – 15 minutes to achieve the same true flavour.And while one may wonder what’s the point, there’s a big difference between cooking down onions for almost an hour on the stove vs 10 minutes.

Plus, no having to man-handle a gigantic mound of onions in a pot that’s too small (me, me!).

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THE REST IS EASY!

Caramelised onions aside, the rest of the soupis effortless. Get all the tasty brown stuff off the bottom of the pot by deglazing it with a touch of wine. A touch of flour to thicken the soup every so slightly, a LOT of broth, and an optional sprig of thyme and bay leaves.

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GOOD BEEF BROTH IS A MUST!

If you use store bought, which I often do, use agood quality beef broth/stock.I personally do not recommend any of the mainstream brands sold in Australian supermarkets. I use Maggie Beer and Moredough from Harris Farms (I stock up when it’s on sale!), or private labels from butchers.

If you can’t get good quality beef broth,use chicken or vegetable instead. I find that the quality of those by mainstream brands is much better than the beef stock. The beef is fine to use in things like gravy and stews, but not when it’s a key ingredient like in this recipe.

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DON’T HAVE OVEN-PROOF SOUP BOWLS?

Neither do I! Can’t justify the storage for ONE soup that calls for it. Sure, it looks thoroughly dramatic to be served a piping hot bowl from the oven with the entire surface covered in bubbling cheese (and a piece of bread under there somewhere).

But actually, I prefermaking grilled cheese separately and popping them in the bowl because the bread isn’t as soggyfrom absorbing the soup by the time it gets to the table.

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And lastly, a little tip – try the grilled cheese with your very own homemade Artisan bread. It is mind blowingly easy and has been wildly popular with readers since the day I shared it!–Nagi x

FRENCH ONION SOUP RECIPE
WATCH HOW TO MAKE IT

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French Onion Soup

Author: Nagi | RecipeTin Eats

Prep: 20 minutes mins

Cook: 1 hour hr 30 minutes mins

Total: 1 hour hr 50 minutes mins

Soup

French

4.85 from 475 votes

Servings4 - 6

Tap or hover to scale

Recipe video above. One of the most epic soups of the world does take time to make but it's so worth it! The deeply caramelised onions make an incredible flavour base for the broth. And that cheesy toast is a must! See recipe notes for SLOW COOKER Caramelised Onions.

Ingredients

  • 100 g / 3.5oz unsalted butter
  • 1.25 kg / 2.5 lb brown / yellow onions , peeled, halved, thinly sliced top to bottom (Note 1)
  • 3/4 cup (185ml) dry white wine , optional (Note 2)
  • 2 tbsp flour , plain / all purpose
  • 1.5 litres / 6 cups / 1.5 quarts good quality beef broth./stock OR chicken , low sodium/salt reduced (Note 3)
  • 2 dried bay leaves (or 3 fresh) (optional)
  • 3 sprigs fresh thyme (optional)
  • Salt and pepper

Cheesy Toast

  • 6 - 8 slices French baguette or other softish bread (Note 4)
  • 100 g / 3.5 oz gruyere or mozzarella cheese, or other melting cheese of choice
  • Fresh parsley or thyme leaves , for garnish (optional)

Instructions

Caramelise Onions (See Notes for SLOW COOKER option)

  • Melt butter in a heavy based casserole pot over medium heat. When it starts to foam, add onions and stir to coat in butter.

  • 30 min on medium low:Turn heat down to medium low. Cook for 30 minutes stirring every few minutes, until the onions have softened and are semi transparent.

  • Salt, 20 min on medium high:Turn heat up to medium or medium high. Add salt, and cook for a further 20 - 30 minutes, stirring more regularly, until onions are deep golden and sweet.

Make Soup:

  • Deglaze: Add wine, then simmer rapidly for 2 minutes until mostly evaporated, stirring to scrape the bottom of the pot.

  • Flour:Sprinkle flour over the onion and cook for 1 minute.

  • Add broth & herbs:Add broth, thyme and bay leaves.

  • Simmer:Cover, lower heat so it's simmering gently then simmer for 30 minutes.

  • Serve:Season to taste with salt and pepper. Ladle into bowls. Top with 1 or 2 slices of cheesy toast.

Cheese Toast:

  • Preheat grill / broiler to high.Toast each side of bread until light golden.

  • Top bread with cheese, then grill until melted and some brown spots appear.

Recipe Notes:

1. Onions - halve them then cut from the top to bottom (see video). It makes them hold their shape better when cooking and you don't get stringy bits. But it's not a big deal! Half the onions in the video were accidentally cut the other way.

2. Wine is used to deglaze the pot here, to get the brown stuff off the base of the pot and also the wine adds flavour into the soup broth. It's fine to skip it - the beef broth ends up having the same deglazing effect.

Any non-sweet, non-woody wine is fine. Sauvignon Blanc, Pinot Gris are what I use.

3. Broth/stock - French Onion Soup can be made with chicken or beef broth. It is more commonly made with beef stock, from what I have observed.

Use agood quality beef stock. I personally do not recommend mainstream brands from major supermarkets in Australia. I use Maggie Beer andMoredough from Harris Farms, , or private labels from butchers.

It isbetter 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). So it's best not to use chewy artisan breads like sourdough. The softer the crumb, the better. Even a thick standard sandwich bread would work!

5. SLOW COOKER CARAMELISED ONIONS (see recipe video above) - Read in post for background. Directions: Place onions in slow cooker, toss with 2 tbsp (30g) melted butter. Slow cook on LOW for 10 hours. Onion will be browned but won't have a proper caramelised flavour. Add 2 tbsp (30g) butter into large pot over medium high heat. Tip in allthe onions and SOME (not all) of the juices fromslow cooker. Cook 10 to 15 minutes until deeply caramelised. Proceed with recipe.

6. Nutrition per serving,assuming 6 servings.

Nutrition Information:

Serving: 435gCalories: 386cal (19%)Carbohydrates: 34.3g (11%)Protein: 15.6g (31%)Fat: 21g (32%)Saturated Fat: 12.2g (76%)Polyunsaturated Fat: 8.8gCholesterol: 54mg (18%)Sodium: 1128mg (49%)Fiber: 3.6g (15%)Sugar: 6.9g (8%)

Keywords: French Onion Soup

Did you make this recipe?I love hearing how you went with my recipes! Tag me on Instagram at @recipe_tin.

COMPLETE YOUR FRENCH MENU!

LIFE OF DOZER

I KNEW I’d find a use for those onion goggles one day! 😂(I don’t need them, I wear contacts so I’m onion-proof. Gimme all the onions to chop!)

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French Onion Soup recipe originally published inSeptember 2016 as part of a Chasseur cast iron cookware giveaway. Since this time, the recipe has evolved (adding more flavourings – wine, thyme and bay leaves) so new photos, words and recipe video added!

French Onion Soup (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 French onion soup and regular 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.

Is French onion soup good or bad for you? ›

Well, you'll be pleased to know that french onion soup is, in fact, a highly nutritious choice.

What broth is French onion soup made of? ›

What Is French Onion Soup? French onion soup, or soupe à l'oignon gratinée, is a classic French dish made with caramelized onions and beef stock or broth. The soup is topped with bread and cheese, then gratinéed to rich, gooey perfection. It's traditionally served in a ramekin or a ceramic crock with a handle.

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.

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.

Are red or yellow onions better for French onion soup? ›

Onions: You can use white, yellow or red onions for French onion soup. But to make it the classic way, you will need 5-6 large yellow onions, peeled and thinly sliced. Butter: The tastiest (French) way to caramelize those onions.

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).

How should onions be cut for French onion soup? ›

Get the oven to 400 degrees while you prepare the onions: Cut down through the poles of each onion, down through the root end into and through the stem end. Peel each half, keeping the flesh tethered at the root end. Slice 1/4-inch thick longways, pole-to-pole, using a mandolin if you have one.

What is the etiquette for eating French onion soup? ›

With such a soup, a knife is your friend, not your enemy. Using both the soup spoon and the knife, push the baked cheese against the rim of the cup or bowl and cut it gently with the knife. Once you've broken the cheese barrier, you can use the knife again to nudge bits of cheese onto the spoon.

Do people in France eat French onion soup? ›

The food writer Waverley Root comments that the origins of French onion soup may lie in Alsace, although the dish is popular throughout France and "apparently no region lays particular claim to it". Onion soups from other regions include the tourain from Quercy-Périgord and the ouliat from the Béarn.

Is French onion soup a laxative? ›

The natural way to overcome the problem is to eat foods which have a naturally laxative effect - such as onion soup, pears, plums, bran, linseed oil, green vegetables and minerals - and avoid starchy foods and white flour products.

How do I make my French onion soup taste better? ›

Fresh thyme: always go with fresh thyme sprigs over dried. Worcestershire sauce: the flavors in Worcestershire sauce are a mix of vinegar, garlic, chile, molasses, etc. which act as the French onion soup spices. A tablespoon goes a long way to help bring out the umami flavors.

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.

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.

How do you make French onion soup not bland? ›

Fix a bland onion soup by using supermarket broth and mild white onions, tasteless oil for sauteeing, stale plain white bread instead of croutons, and mild white cheese. Start by reducing the broth. Simmering out some water will intensify the flavor of the broth. Once you get it to the right point, add some salt.

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.

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 I make my French onion soup darker? ›

The caramelized onions are what give the soup its rich dark flavor and color, so don't skimp! Use a good quality beef broth. We use Better Than Bouillon to make our beef broth because it's extremely flavorful and contains a decent amount of salt, which seasons the soup well.

References

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