Soupe à l'oignon
Soupe à l'oignon gratinée
Onions cooked past politeness, beefy broth, and a lid of bread and molten cheese.
Recipe by I Want Some Food · Reviewed by the editorial kitchen. Native name preserved: Soupe à l'oignon gratinée.
0 people cooked this in the public kitchen yet. Kitchen-tested by I Want Some Food. Not a purchased rating.
- Prep
- 15 min
- Cook
- 1 hr 15 min
- Rest
- None
- Total
- 1 hr 30 min
- Difficulty
- Medium
- Spice
- No chilli
- Cost
- Weeknight budget$8–16 USD · indicative, not a store price
About
French onion soup is a pot of onions cooked until they are mahogany, then deglazed and simmered in stock, served under toasted bread and cheese that you grill until it drools. The work is time, not technique. If the onions stay blonde, you have onion water. Slice the onions pole to pole so they hold their length while they brown; half-moons collapse into jam too early. Use a wide pan so moisture can leave, and resist turning the heat up when they look wet — that is water, not failure. A splash of dry white wine or a spoon of brandy to lift the fond is useful if you already drink it; stock and patience also finish the job. Taste for a savoury sweetness that is brown, not burnt. The bread should be stale enough to float without dissolving, and the cheese should be a melting alpine style rather than a rubber slice. Grill until the lid blisters and the edges catch. Serve in bowls that can take the heat; a cold ceramic plate kills the drama.
Ingredients
- Onion, thinly sliced1.2 kg
- Butter40 g
- Olive oil15 ml
- Wheat flour15 ml
- Water, or unsalted beef or chicken stock1.2 l
- Thyme4.9 ml
- Bread, stale baguette4 slice
- Melting cheese, gruyère or similar, grated150 g
- Salt4.9 ml
- Black pepper2½ ml
Scaling multiplies the written quantities. Baking still prefers a scale.
Steps
Step 1
Cook onions in butter and oil with salt over medium-low, stirring, 40–50 minutes until deep brown. Do not scorch.
45 minTip: A pinch of sugar is allowed if they stall. A handful is jam, not soup.
Step 2
Stir in flour 1 minute. Add stock, thyme and bay. Simmer 20 minutes. Pepper. Taste: sweet, savoury, brown.
22 minStep 3
Toast bread. Ladle soup into ovenproof bowls, top with bread and cheese. Grill until bubbling and spotted.
8 min
Adapt this recipe
The canonical recipe stays intact. Personal versions are labelled. Serving changes are maths, not AI.
Adaptations · 0 / 15 used. Resets 10 October.
Substitutions
Beef stock → Mushroom stock plus soy
A vegetarian bowl. Still caramelise the onions properly.
Tips
- Yellow onions, not red. Red goes muddy.
- Wine for deglazing is classic if you drink it. Water and patience also work.
History & culture
A Parisian market-hall and bistro bowl. Home cooks make it because cheese and onions are cheap and the house smells like a restaurant. Les Halles porters were said to drink a restorative bowl after the night market, and that story still sells the dish even though the market itself has moved. Bistros keep it as a winter lunch because the ingredients are humble and the smell does restaurant work. At home it is a Saturday project: you cannot rush the onions and still have guests at a civil hour. Vegetarian houses swap mushroom stock and a dash of soy without pretending they have made beef. Gruyère is the postcard cheese; Comté, Emmental, or a mix with a little Parmesan all behave. The soup is not a starter in the polite sense — it is the meal, with maybe a green salad after. Tourist menus over-thicken it; a home pot should still be spoonable broth under the lid.
Onion soups are old poor-food. The gratinéed cheese lid is a 19th–20th-century brasserie flourish that became the postcard. Onion broths appear in medieval European cookery as poor-food and as a supposed hangover cure, long before anyone put a grilled cheese hat on top. The gratinée that tourists photograph is a nineteenth- and early twentieth-century Parisian brasserie flourish, helped by cheaper glass cloches, restaurant salamanders, and the rise of alpine cheeses in urban markets. Julia Child and later television cooks exported the long caramelisation as a badge of seriousness. American diners sometimes sweetened it into a candy onion soup; that is a different bowl. Wine in the deglaze is classic restaurant language, not peasant law. Home versions using water and a Marmite-like boost are honest when stock is poor. The dish remains a study in time as the only expensive ingredient.
Traditional
Provenance: Editorial adaptation.
Questions about this recipe
Answers taken from this dish's times, amounts, swaps and tips — not a chatbot.
How long does Soupe à l'oignon take?
1 hr 30 min all in — 15 min prep, 1 hr 15 min cook. Cook and rest follow the method. Leftover storage and optional extra waits are not included.
How many does it serve?
The recipe is written for 4 bowls. Scale the ingredient list on the page if you are cooking for a different number.
How hard is it?
Medium.
How spicy is it?
No chilli.
What allergens should I watch?
This recipe is labelled for Milk, Wheat. Labels are informational — check the packets in your kitchen. This is not medical advice.
Does it fit a diet?
The published recipe is labelled Vegetarian, Nut-free.
What does it cost to cook?
Weeknight budget — about $8–16 USD, as a grocery budget for this recipe, not a restaurant price.
What equipment do I need?
Dutch oven, Oven.
How much salt do I put in?
The recipe lists Salt at 1 tsp.
What can I use instead?
Beef stock → Mushroom stock plus soy. A vegetarian bowl. Still caramelise the onions properly.
Any tips from this recipe?
Yellow onions, not red. Red goes muddy. Wine for deglazing is classic if you drink it. Water and patience also work.
Can I use an air fryer?
This method is not written for an air fryer. The core technique on the page still applies.
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