Traditional French Onion Soup
A proper French onion soup is about the transformation of the onion. There is no shortcut to the depth that comes from slow, steady caramelization.
Patience is your primary ingredient.
Do not rush the onions. If you crank the heat to save time, you will burn them rather than caramelize them, resulting in a bitter soup.
- Heavy-bottomed Dutch oven
- Wooden spoon
- Oven-safe bowls
- Chef's knife
What goes in.
- 3 lbyellow onions, peeled and thinly sliced
- 4 tbspunsalted butter
- 2 tbspolive oil
- 1/2 cupdry white wine
- 6 cupshigh-quality beef stock
- 1bay leaf
- 1/2 tspdried thyme
- 1baguette, sliced into 1-inch rounds
- 2 cupsGruyère cheese, freshly grated
Sweating vs. Browning
The onions must move past translucent to a deep, dark brown. This requires stirring every few minutes for at least 45 minutes to ensure an even, jammy consistency without scorching.
The method.
Caramelize the onions
Melt butter and oil in the Dutch oven over medium heat. Add onions and cook, stirring occasionally. Once they soften, reduce heat to medium-low and continue for 45 to 60 minutes until they reach a deep, rich brown color.
Deglaze and simmer
Pour in the white wine to scrape up the browned bits from the bottom of the pot. Add the beef stock, bay leaf, and thyme. Simmer partially covered for 30 minutes.
Prepare the bread
While the soup simmers, toast the baguette slices in a 350°F oven until they are crisp and golden.
Assemble and broil
Ladle soup into oven-safe bowls. Place a slice of toasted bread on top, cover generously with grated Gruyère, and broil until the cheese is melted and browned.
Other turns to take.
Cognac Finish
Add a tablespoon of cognac to the soup just before ladling to add a sharp, aromatic note.
When it doesn't go to plan.
Use a mix of yellow and red onions for a more complex profile.
Ensure your beef stock is well-seasoned, as it is the foundation of the final flavor.
Let the soup rest for 15 minutes after simmering to allow the flavors to marry before serving.
The ones that keep coming up.
Can I use a different cheese?
While Gruyère is traditional due to its melting qualities and sharpness, Comté or Emmental are acceptable substitutes.
How do I know the onions are done?
They should look like dark, thick marmalade and smell sweet, not like charred vegetable scraps.
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