French Onion Soup
Updated April 15, 2024
- Total Time
- 1 hour 30 minutes
- Prep Time
- 10 minutes
- Cook Time
- 1 hour 20 minutes
- Rating
- Notes
- Read community notes
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Ingredients
- 3tablespoons unsalted butter
- 3 to 4large red or yellow onions (about 3 pounds), peeled and thinly sliced
- ¾teaspoon kosher salt, plus more to taste
- 2quarts beef stock (8 cups)
- 1cup dry white wine
- 1tablespoon dry sherry
- 1tablespoon all-purpose flour
- ½teaspoon black pepper, plus more to taste
- 8 to 12(½-inch) slices French bread (from 1 loaf)
- 1½cups grated Gruyère cheese
Preparation
- Step 1
Melt butter in a heavy Dutch oven over medium heat. Add onions and ½ teaspoon salt, stir and cover, letting onions soften for 5 minutes. Remove lid and let onions caramelize until golden brown over medium heat, stirring occasionally. Adjust heat if onions are browning too quickly. The caramelization process may take 45 to 60 minutes.
- Step 2
Meanwhile, warm broth in a saucepan over low heat.
- Step 3
Once onions are caramelized, add wine and sherry to the pot and allow mixture to come to boil. Stir in flour and let thicken for a minute or two.
- Step 4
Slowly add warm broth, ¼ teaspoon salt and the pepper to the onion mixture and boil uncovered for 10 minutes. Add more salt and pepper to taste.
- Step 5
Heat the broiler, and arrange individual ovenproof casseroles on a baking sheet. Ladle soup into casseroles, and cover top with bread slices. Sprinkle each casserole generously with Gruyère.
- Step 6
Broil for a minute or two, watching carefully, until cheese melts and browns. Serve immediately.
- You can prepare the soup through step 4 up to 2 months in advance. Thaw and reheat, then top with the bread and cheese and broil to serve.
Private Notes
Cooking Notes
Simplify by making overnight caramelized onions. Fill slow cooker with 4-5 lbs sliced onions, pour 1/3 cup olive over the onions & mix well. Cover with lid and cook on HIGH for 7-9 hours. Yes it does indeed needs to be High. I had my doubts at first, but I've done this probably at least 20 times and the onions cook way down & caramelize beautifully. I haven't tried this yet with my new multi-cooker but plan to try that next using slow cooker function.
1 Tbsp of Sherry is a very small amount, it won't add any significant flavour. Also, if Sherry boils for a long time, it completely loses its aroma. I suggest adding 2 tbsp on each individual soup dish just before broiling (that's the way people have fancy consomme in Madrid).
When I make French Onion Soup, I cut the bread into crouton sized pieces and then brown them in butter in a large skillet on the stove. I use them in place of the toasted bread. It makes the soup easier to eat--no cutting through hard French bread crusts with a spoon--and I really like the extra flavor imparted by the croutons. And, I save some croutons for the leftover soup.
Great and easy recipe. I suggest doubling the onions and mixing in some leeks. Also, since I don't have oven proof casseroles, I toasted the bread with the cheese on top (in toaster oven), and served on regular soup bowls.
I used vegetable stock plus a little soy sauce and a little bit of Worcestershire sauce instead of the beef broth to make it vegetarian. It was amazing! Thank you for the wonderful recipe.
Toast bread first.
If you have it, use bacon fat rather than butter to carmelize the onions. Makes a huge flavor difference.
This soup is marvelous, and perfect for a chilly day. I followed the recipe faithfully and used homemade beef stock. The hardest part for me was slicing those onions. My eyes were tearing so much, I had to put on a scuba mask to finish this step.
Loved this recipe. Finally somebody admits how long it takes to actually caramelize onions! The flavor is wonderful. I did cut the amount of beef broth to 6 Cups, because I agree with other cooks, there were just not enough onions to sustain 8 cups of broth. Next time I will double the onions.
Great flavor but I’d say to double the onions.
Several folks thought the amount of onions called for was insufficient. Note it says “ 3 or 4 large onions ( about 3lbs.). My onions were a little larger then a baseball and it took 9 to yield 3 lbs.
Don't get super hung up on the quantities in recipes. Treat it as more of a basic guideline with orderly steps. It's cooking, not science. This is a really good recipe for this soup. I just used the ingredients listed here in varying quantities and it was fantastic. I really, really, REALLY suggest making your own beef (or other) broth for this. Harris Teeter sells 2 lb. bags of beef bones. I used two bags, boil/rinse, roast, boil/simmer with shallots, garlic, thyme for 5 hours. Fantastic.
Delish and relatively easy. I took the advise of some posters here and added an onion and a leek. I also added a couple tablespoons of brandy with the wine and sherry, and some thyme with the stock. After all the stock was in, I let the soup reduce for 30 min. Oh, and I toasted the bread with butter under the broiler before adding to the soup. YUM!
Broth and stock are used interchangeably in this recipe; they are not the same. Broth is made with vegetables, stock is made with just bones. I think the latter would be best here.
French onion soup is heavily dependent on using good broth. Do yourself a favor and make it. Great recipe.
This was delicious but did require using about twice as many onions as recommended. I used boxed beef broth and added a little Worcestershire and a little fish sauce to up the umami. Added extra sherry. Still missing something...might add fresh thyme next time I prepare. Used fresh homemade sour dough bread which was very easy to spoon through. Also added a touch of Gouda on top for extra meltiness.
too much broth -- use 5 or 6 cups of beef stock. doubled the sherry. onions and oils in the slow cooker for 6ish hours lid on, then 2ish lid off. turn bread into croutons. made 5 satisfying servings.
I rely on the notes because they are so helpful. I took note of adding more sherry I stirred in before ladling into bowls, toasting the bread and cutting into pieces. This was a silky beautiful soup that I will definitely make again-it was excellent.
I loved the soup, but prefer more of a beef broth red wine version. The caramelization process was perfect.
I've always had a problem with the long strings of tasty but very gooey cheese that results from melting Gruyere as this recipe recommends. You almost need 'cheese scissors' to cut the cheese strings. But there is an easy fix for this. A few drops of lemon juice, mixed into the cheese before topping the soup will make the cheese melt more readily and will give the cheese an even deeper and richer, more-nuanced flavor.
The knife or cutting blade used for onions is a very important key. Use knife with thinnest blade possible,preferably with a thinned edge. My tomato slicing serrated knife works great- the onion cells are more intact and release less juice and no eye irritation than with a very sharp chef prep knife. Try side by side with several knives- if you get a lot of juiciness you are pressing and smashing onion cells instead of slicing. Also vertical cuts pole to pole work better than cross cut slices.
Add chicken broth bouillon to water
My husband was a maitre’d at a very nice restaurant when he was young. The chef there used 2 parts beef broth to 1 part chicken broth, and it has a milder flavor. I use 1/3 cup sherry.
I love this recipe! I agree with other reviewers that the more onions the better and be generous with the sherry. I’m not sure what type of onion may be best. Next time I make this I may blend Yellow, red and sweet onions. (Yellow and red may have a stronger flavor?
I got a job as a prep cook at the Trident in Sausalito. We had a French Chef at this Ultimate Hippie place. I marveled at the way Pierre could print money with French Onion soup. I have not lost my reverence for this soup. I do make the croutons differently now. I make a dry toast of good white bread, rub it with raw garlic, spread it with butter and grated real Gruere lightly then toast it dry again. High flavored much lower fat dip the toast in the soup to stay crisp.
I use half beef stock and half chicken stock. I'm going to try it using a dark beer instead of red wine.
I have used a Wok before to caramelize the onions and it works well. 90 minutes for full glorious caramelization. I also add cognac to deglaze the pan instead of sherry for a deeper flavor profile. For a lighter, vegetarian version, I add fresh thyme and a dash of sage to vegetable broth and it is delightful.
Use high quality beef stock of course. We found that Visalia onions are better.
My father used to make this, but once, because a bottle had been mislabeled, used kummel instead of cognac. The caraway flavor was great and that became the standard recipe.
The French bistro in Georgetown where I bartended my college years made a good onion soup with three cheeses melted together on top: provolone, Gruyère, and mozzarella.
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