French Onion Soup
Quick answer
French onion soup is built entirely on patience and heat.
What makes this special
- Slow-cooked onions turn natural sugars into a deep, savory broth in this French classic.
- 40-plus minutes of low-heat cooking drives off moisture and browns onion sugars
- Gruyère melts into a golden crust over the baguette on top of the soup bowl
Key ingredients
Core cooking flow
- 1 Slice the 400 g onions as thinly and evenly as possible so they cook at the same pace.
- 2 Add the onions and mix in a small pinch of the measured salt first.
- 3 Keep the heat low and cook the onions slowly for at least 40 minutes.
French onion soup is built entirely on patience and heat. Thinly sliced onions are cooked in butter over low heat for forty minutes or more, slowly shedding moisture as their natural sugars transform into a deep, golden-brown mass with an intensity of sweetness and umami that raw onions cannot approach. Rushing this step causes the onions to scorch and turn bitter, so controlled, unhurried heat is the most critical variable in the recipe. Dry white wine and beef stock are then added to the caramelized onions and simmered together until the broth absorbs every layer of the onion's concentrated flavor, building complexity through a long, slow reduction. The finished soup is ladled into oven-safe crocks, topped with thick slices of toasted baguette, and blanketed with a generous layer of grated Gruyere. Under the broiler, the cheese melts, bubbles, and browns into a golden crust with long, elastic strings that stretch when broken with a spoon. Beneath that crust lies the reward: a dark, concentrated broth steeped in caramelized onion depth, with bread softened into the soup and cheese draped across every spoonful. A bowl where simple ingredients, time, and heat produce something far greater than the sum of their parts.
Instructions
Read the steps as a cooking flow: prep, heat, seasoning, doneness control, and finish.
- 1Control
Slice the 400 g onions as thinly and evenly as possible so they cook at the same pace.
Melt 2 tablespoons of butter in a heavy pot over medium-low heat, letting it foam without browning.
- 2Season
Add the onions and mix in a small pinch of the measured salt first.
Stir often for the first 10 minutes so the onions release moisture, soften evenly, and do not catch on the bottom.
- 3Heat
Keep the heat low and cook the onions slowly for at least 40 minutes.
They should shrink, turn glossy, and become deep brown; if dark spots appear before the whole batch browns, lower the heat.
- 4Control
Pour in 600 ml beef stock and add 0.5 teaspoon thyme, scraping the browned onion layer from the bottom into the broth.
Simmer gently for 10 minutes so the stock takes on the onion flavor.
- 5Season
Season with the remaining salt and 0.5 teaspoon black pepper, tasting before adding all the salt because the cheese will add salinity. Ladle the hot soup into oven-safe bowls, leaving room for bread and cheese.
- 6Finish
Place the 4 baguette slices over the bowls and cover them with 90 g grated Gruyere.
Broil until the cheese melts, bubbles, and forms golden spots, then serve while the bread is soaked but still holding shape.
After the steps
Pick a recipe that fits this dish.
Continue with shared ingredients, meal pairings, or a similar method.
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French Onion Tart
The preparation of a French onion tart begins with slicing onions and cooking them in butter using a low heat setting for more than twenty minutes. During this extended cooking duration, the onions collapse into a dark amber mixture, ensuring that their natural sweetness is fully concentrated while the sharp bite associated with raw onions is completely eliminated. Once the onions have reached this state, they are spread in an even layer over a tart shell that has already undergone blind baking to maintain its texture. A custard liquid made from a combination of eggs, heavy cream, and thyme is poured over the onions. Grated Gruyere cheese is then scattered across the top surface before the tart is transferred to an oven preheated to 190 degrees Celsius. The baking process continues until the internal filling has set into a firm consistency and the cheese layer has transformed into a browned, salty crust. The flavor of the caramelized onions is the most prominent characteristic of the dish, providing a sweetness that builds on the palate with each bite. Thyme is used to contribute a distinct herbal note, which functions to offset the richness of the dairy components and prevent the tart from becoming cloying. The addition of Gruyere cheese brings a nutty and salty element that balances the sweet and savory aspects of the tart. This specific dish is known for holding its quality well when served at room temperature, which makes it a versatile choice for inclusion in brunch menus, sequences of wine pairings, or meals eaten outdoors.
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