Classic French Onion Soup Recipe (2024)

byBeth Le Manach

10 Comments

byBeth Le Manach

10 Comments

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This French Onion Soup Recipe is one of those classic French recipes worth mastering. It will become your new favorite soup recipe in your fall rotation.

It’s typically something most people only come across in restaurants so to present your guests with a homemade version makes any occasion extra special. It’s decadent and hardy and will take the chill off any cold winter’s night.

Classic French Onion Soup Recipe (1)

Why You’ll Love This Recipe:

It’s a great one for entertaining because the majority of the prep can be done in advance, leaving you with just the bread and cheese topping to broil on top. Sounds simple enough right? And I’m here to tell you it is!

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Step#1: Prep the Onions

  • For this recipe, you’ll use 8 yellow onions.
  • This may sound like a crazy amount of onions, but they will wilt down once cooked.
  • I also find this is what makes for a great French Onion soup, lots of onions! Otherwise, it ends up being too watery.

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Step#2: Cook Onions Down and Add Sherry

  • Place the onions in a large stockpot and cook them down in the oil and butter until nicely wilted.
  • It also helps to cover them in between stirring, to help them cook faster and become nicely wilted.

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Adding the Sherry

Once the onions are very wilted you’ll add the sherry. The sherry provides a lovely sweet flavor to the onions that French onion soup is known for.

For a French onion soup without alcohol:

  • Omit the sherry altogether, it will still be delicious
  • Or replace the sherry with 1 teaspoon of balsamic vinegar.

Step#3: Add the Beef Broth

The beef broth is the main base for this soup, so be sure to buy a high-quality broth. I find the organic broths seem to have the most flavor.

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Adding the Seasonings:

  • I like to add a bouquet of fresh thyme, tied with butchers twine, and two fresh (or dried) bay leaves.
  • Toss these into the broth and as it simmers it will steep into the broth and flavor it with the most delicious flavors.

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Step#4: Choosing the Right Bread and Cheese

The bread and the cheese are the crowning glories of this soup. Pick the wrong kind of bread and it will disintegrate quickly into mush under the heat of the soup and the weight of the cheese.

Pick the wrong cheese and your soup won’t have much flavor or gooeyness.

For the Bread:

  • I find the best bread to use is a day-old sourdough baguette. Buy the bread a day before and then place it in the refrigerator overnight. Otherwise if left out at room temperature it will become too hard to slice
  • Slice the bread into at least 1″ inch thick slices. This will also help it hold up under the weight of the cheese and heat of the soup.
  • This will assure you’ll have a little bite of bread in many spoonfuls of the spoon

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For the Cheese:

  • For both the flavor and the gooeyness, Gruyere wins hands-down. Gruyere can be a bit pricey but I find Trader Joe’s has an affordable Gruyere/Swiss Cheese which is quite good!
  • If you can’t get Gruyere you could also use regular sliced swiss cheese sold for sandwiches. And top the bread with at least 2-3 slices
  • Or a third option would be White Cheddar or Mozzarella cheese. Mainly for the gooeyness, but the flavor would be pretty bland. So to amp it up a bit you could add some grated parmesan on top too.

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Step#5: Broiling and Garnishing

I place at least 2 slices of bread in the soup bowl, top with lots of cheese, and then place on a sheet pan, lined with foil. This will make your pan easier to clean in case the cheese spills over and bakes into the pan.

  • I also like to use soup bowls that have handles on them. It makes the soup bowl easier to take in and out of the oven.
  • The lower the profile on the bowl, the better. It will allow them to get up closer to the broiling implement of your oven which you’ll need to get the cheese nice and crispy.
  • Whichever bowl you use, just make sure it’s oven safe!

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Then you can garnish the soup with a sprig of fresh thyme, and some freshly cracked black pepper. You’ll have a delicious hearty lunch or dinner! Or serve this soup as a starter in smaller bowls, for a holiday meal.

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How To Freeze This Soup?

  • To freeze, portion the soup into freezer-safe containers and freeze for up to 2 months.
  • Re-heat in the microwave and then proceed with the bread and cheese as directed

More French Recipes!

  • Coq Au Vin
  • Classic French Apple Tart
  • Tartiflette-The MUST make Holiday Side Dish!
  • Easy Homemade Crepes
  • Foolproof Madeleines
Classic French Onion Soup Recipe (10)

French Onion Soup

Yield: serves 8

Prep Time: 1 hour

Cook Time: 5 minutes

Total Time: 1 hour 5 minutes

Learn how to make a classic French Onion Soup that is as easy as it is delicious!

Ingredients

  • 1 tbsp (15 ml) olive oil
  • 1 tbsp (15 g) of butter
  • 8 medium yellow onions, sliced thinly into half moons
  • 1 tsp (5 ml) salt
  • 1 tsp (5 ml) sugar
  • ¼ cup (60 ml) dry sherry
  • 10 cups (2,500 ml) beef stock
  • 4 sprigs Thyme (tied with butcher string) + 1 tbsp for garnish
  • 2 Bay leaves
  • 1 garlic clove minced
  • 1 tsp (5 ml) salt
  • freshly cracked pepper
  • 1 day old French baguette (sourdough works well) cut into ½ inch slices
  • 3 cups (300 g) Gruyere cheese

Instructions

  1. Place olive oil and butter in a Dutch oven or large soup pot. Add onions, salt, and sugar. Cook uncovered on medium high heat, stirring occasionally until onions turn golden brown and caramelized. 20-25 mins.
  2. Add sherry to onions and cook 1 min until alcohol evaporates. Add beef stock, thyme, bay leaves and garlic.
  3. Simmer covered for 10 mins to allow flavors to marry.
  4. Preheat oven to the broil setting. Ladle out soup in heat safe, shallow bowls. Place on a rimmed cookie sheet. Top each soup with 2 slices of bread, and 1/2 cup (50 g) of cheese sprinkled on top.
  5. Place soups under the broiler until cheese is bubbly and golden brown. Garnish with fresh thyme and serve on a plate.

Notes

It's best to use day-old sourdough baguette bread (that has been refrigerated) for the bread slices. It will hold its shape better once broiled.

To make French Onion Soup without Alcohol, either omit the sherry altogether (it will still be good) or add 1 tsp of balsamic vinegar which will create a similar flavor profile for the onions.

Make-Ahead Tips:

  • You can make the soup base a day before and just top it with bread and cheese and broil before serving! Makes this really easy for entertaining!
  • To freeze, portion the soup into freezer-safe containers and freeze for up to 2 months. Re-heat in the microwave and then proceed with the bread and cheese as directed
Nutrition Information:

Yield: 8Serving Size: 1
Amount Per Serving:Calories: 222Total Fat: 10gSaturated Fat: 4gTrans Fat: 0gUnsaturated Fat: 6gCholesterol: 23mgSodium: 518mgCarbohydrates: 21gFiber: 1gSugar: 9gProtein: 11g

Classic French Onion Soup Recipe (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 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 red or white wine better in French onion soup? ›

That said, French onion soup's other key ingredients are beef broth and gruyere cheese, which accounts for its utterly decadent and robust balance of sweet, creamy, and umami. For umami-rich beef dishes and ultra-creamy cheeses, red wine's complexity, fruitiness, and bitter finish are the optimal choices.

Is French onion soup different in France? ›

French onion soup is a simple combination of caramelized onions, flour, butter, beef stock, and a bit of wine topped with a cheese toast (per The New York Times). While these ingredients are available in France, none of them are uniquely French, so what gives?

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 do you 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.

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 is my French onion soup bland? ›

If the onions are not cooked long enough or over low heat, they won't develop the sweet and rich flavor that is characteristic of this soup. Lack of seasoning: Seasoning is crucial in any dish, and French onion soup is no exception.

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 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.

Is sherry or vermouth better for French onion soup? ›

Alcohol: We use sweet vermouth (Dolin) and Lillet Blanc. You can substitute sweet vermouth with sherry (not sherry cooking wine) or brandy. Lillet Blanc is similar to dry white wine but more aromatic. Your favorite dry white wine is fine.

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.

What is a fun fact about French onion soup? ›

It is said that it was invented by none other than King Louis XV late one night at his hunting lodge when he was very hungry. When he only found onions, butter, and champagne in the pantry, he decided to use the three ingredients to make the French onion soup for the very first time.

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.

Why is French onion soup good for you? ›

As part of the Allium family, along with leeks, shallots, garlic and chives, onions have long been associated with numerous medicinal benefits. They are a very good source of vitamin C and B6, iron, folate, and potassium and are known to provide cold and flu relief with its anti-inflammatory properties.

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.

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.

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