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French onion soup is the dish that punishes shortcuts. Most home versions are pale, thin, and over-cheesed in an attempt to compensate for an under-developed broth. The fix is patience: forty-five to sixty minutes of slow onion-caramelisation that nobody wants to do but every great onion soup demands.

Do that one step right and the rest of the recipe is just assembly. The reward is a soup that tastes like a Parisian bistro on a wet Thursday in February. Sticky-sweet onions, deep beef broth, a slice of toast holding up a molten golden cap of melted Gruyere.

The caramelisation rule

The single difference between great onion soup and forgettable onion soup is how long you cook the onions. There are no shortcuts. Set a timer for an hour. Stir every 5-7 minutes. Walk away in between. The onions will go through stages: translucent, then pale gold, then medium gold, then jammy dark brown. You want the dark-brown stage. If they’re anywhere lighter, the soup will taste flat.

If you have to leave them for ten minutes and they brown a bit faster than you wanted, fine. If they catch and burn at the edges, scrape and add a tablespoon of water and lower the heat. They’re forgiving. Just don’t rush.

Scotty Boxa

French Onion Soup (Done Right, With the Cheese Crust)

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French onion soup with a proper cheese-and-bread crust. Caramelised onions cooked low and slow for an hour, deep beef broth, melted Gruyere on top. Done right.
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Prep Time 15 minutes
Cook Time 1 hour 30 minutes
Total Time 5 minutes
Ingredients Method Nutrition Notes

Ingredients
 

  • 6 large brown onions, thinly sliced about 1.2kg total
  • 4 tbsp unsalted butter
  • 1 tbsp olive oil
  • 1 tsp sugar
  • 1 tsp salt
  • 3 cloves garlic, minced
  • 1/2 cup dry white wine or sherry 125 ml
  • 1.5 L beef stock, hot
  • 2 sprigs fresh thyme
  • 1 bay leaf
  • 1 tbsp Worcestershire sauce
Topping
  • 4 slices baguette, toasted about 2cm thick
  • 200 g Gruyere cheese, grated or comté

Instructions
 

Method
  1. Melt butter with olive oil in a large heavy pot over medium heat. Add the sliced onions, sugar, and salt. Stir to coat.
  2. Cook the onions slowly, stirring every 5-7 minutes. After about 20 minutes they'll be soft and translucent. After 45-60 minutes they'll be deeply golden brown and jam-like. Don't rush this step.
  3. Add minced garlic. Stir 1 minute.
  4. Pour in the wine. Scrape the bottom of the pot to lift any caramelised bits. Cook 2-3 minutes until the wine reduces.
  5. Add hot beef stock, thyme, bay leaf, and Worcestershire. Simmer uncovered 20 minutes.
  6. Taste and adjust salt and pepper. Fish out the herbs.
  7. Preheat your grill (broiler) on high. Ladle soup into oven-safe bowls. Float a slice of toasted baguette on top of each. Cover generously with grated Gruyere.
  8. Place bowls on a tray under the grill. Grill 2-3 minutes until the cheese is bubbling and golden brown. Serve immediately while everything is bubbling.

Nutrition

Calories: 480kcal

Notes

The onion stage is everything. Don't try to caramelise onions at high heat. They burn before they brown. Low and slow, 45-60 minutes minimum, stirring occasionally. They should reduce to about a third of their original volume and be the colour of dark caramel.
Gruyere alternatives. Comté is even better but harder to find. A good Swiss or a sharp cheddar mixed with parmesan also works.
Bowls. Ovenproof. The grill step requires it. Standard ceramic mugs or restaurant-grade onion soup bowls both work.
Servings: 4 people
Calories: 480

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Serving notes

The right move is to serve immediately, with the cheese still bubbling under the grill. The wrong move is to make it ahead and reheat. The cheese gets rubbery, the bread gets soggy. If you must prep ahead, prep the soup base (everything up to step 6). On the night, ladle, top, grill, serve.

Sides: a green salad with sharp vinaigrette to cut the richness. A glass of pinot noir or a dry sherry. Crusty bread on the side, because there will be soup that wants to be mopped.

I’m Scotty Boxa. Australian author, professional bad decision maker, and the bloke responsible for the rest of this website.

If you nailed the onion-caramelisation stage, the rest of Heat & Serve will reward you. 25 soup and stew recipes that all live or die on the same kind of patience.