Five Evenings in Paris is a deeply caramelized French onion soup, slowly coaxed over five separate evenings to build layers of sweet, savory flavor. Each brief session—caramelizing, simmering, assembling—lets the onions develop a rich, complex depth that a single-day version can’t match, and the hands-on time stays under an hour per night. It’s a rewarding project for anyone who loves the classic bistro dish and wants to spread the work across a week.
Ingredients
- 5 lb (2.3 kg) yellow onions, thinly sliced
- 6 tbsp (85 g) unsalted butter
- 2 tbsp (30 ml) olive oil
- 1 tsp (5 g) salt, plus more to taste
- 1/2 tsp (1 g) black pepper
- 1 cup (240 ml) dry white wine (e.g., Sauvignon Blanc)
- 8 cups (1.9 L) beef stock, preferably unsalted
- 2 sprigs fresh thyme
- 1 bay leaf
- 1 baguette, sliced into 1/2-inch (1.25 cm) rounds
- 8 oz (225 g) Gruyère cheese, grated
Instructions
- Evening 1 – Caramelize the onions: In a large Dutch oven or heavy pot, melt the butter with the olive oil over medium heat. Add the sliced onions and salt; stir to coat. Cook, stirring frequently, for 45–60 minutes until the onions are deeply golden brown and reduced to about a quarter of their original volume. If they stick, add a splash of water or wine to deglaze. Let cool, cover, and refrigerate overnight.
- Evening 2 – Deglaze and simmer: Return the pot to medium heat. Add the white wine and scrape up any browned bits from the bottom. Cook until the wine has mostly evaporated, about 5 minutes. Add the beef stock, thyme, and bay leaf. Bring to a boil, then reduce to a gentle simmer. Cook uncovered for 1 hour, stirring occasionally. Season with pepper and more salt if needed. Cool, cover, and refrigerate overnight.
- Evening 3 – Simmer again: Reheat the soup over medium-low heat. Simmer gently for 1 hour to concentrate flavors. Taste and adjust seasoning. Cool, cover, and refrigerate overnight.
- Evening 4 – Simmer and chill: Repeat the simmering step: reheat and simmer for another hour, then cool and refrigerate overnight. The soup should be rich and deeply flavored.
- Evening 5 – Assemble and broil: Preheat the broiler. Place oven-safe soup bowls or ramekins on a baking sheet. Ladle the hot soup into the bowls. Top with baguette slices and a generous handful of grated Gruyère. Broil 3–5 minutes until the cheese is bubbly and golden brown. Serve immediately.
Tips
- Use yellow onions: They caramelize evenly and have the right balance of sweetness and sharpness. Sweet onions like Vidalia will make the soup sweeter; red onions will be milder but less traditional.
- Don’t rush the caramelization: If the onions brown too quickly, they’ll turn bitter. Keep the heat medium and stir often. A heavy-bottomed pot prevents scorching.
- Make ahead: The soup can be refrigerated after any evening and kept for up to 4 days. You can also freeze it after Evening 4 for up to 3 months—thaw overnight in the fridge before reheating.
- Common mistake: Adding too much salt early. The stock and cheese are salty, so season lightly at first and adjust at the end.
Serving Suggestions
Serve the soup as a main course with a simple green salad dressed with vinaigrette and a glass of dry white wine. For a heartier meal, add a side of crusty bread and a light cheese plate. It also pairs well with roasted chicken or a simple steak.
Variations
- Vegetarian: Use vegetable stock instead of beef stock. The flavor will be lighter but still delicious.
- Cheese swap: Substitute Comté, Emmental, or a mix of Gruyère and Parmesan for a different nutty flavor.
- Add a splash of brandy or sherry: Stir in 2 tablespoons (30 ml) of brandy or dry sherry during the last 10 minutes of simmering on Evening 5 for extra depth.
- Herb twist: Add a sprig of rosemary or a pinch of dried oregano along with the thyme for a different aromatic profile.
Storage and Reheating
Store leftover soup in an airtight container in the refrigerator for up to 4 days. Reheat on the stovetop over medium heat until bubbling, about 10 minutes. If you’ve already added the bread and cheese, reheat in the oven at 350°F (175°C) for 10–15 minutes until hot and the cheese is melted. For longer storage, freeze the soup (without bread and cheese) for up to 3 months. Thaw overnight in the fridge and reheat gently.
Frequently Asked Questions
Can I use pre-sliced onions or frozen onions? Yes, pre-sliced onions save time, but they may be thicker or thinner than ideal; adjust cooking time accordingly. Frozen onions release more water, so caramelization will take longer—drain excess liquid if needed.
What if I don’t have a Dutch oven? Use any heavy-bottomed pot with a lid, such as a stainless steel stockpot. Avoid thin aluminum pots that can scorch the onions.
Can I skip the wine? Yes, substitute with additional stock or a splash of apple cider vinegar mixed with water. The wine adds acidity and depth, but the soup will still be tasty without it.
Why is my soup too salty? Likely because the stock or cheese was salty. To fix, add a peeled raw potato and simmer for 15 minutes—the potato absorbs some salt. Or dilute with unsalted stock.
Can I make this in a slow cooker? Yes, caramelize the onions on the stovetop first, then transfer to a slow cooker with the remaining ingredients (except bread and cheese). Cook on low for 6–8 hours. The flavor won’t be as deep as the multi-day method, but it’s convenient.
Is it safe to leave the soup cooling overnight? No, always refrigerate within 2 hours of cooking. Cool the soup to room temperature (no longer than 2 hours) before covering and refrigerating.
Related
- Street Food Pakoras: Crispy Onion Fritters
- El Churrasco Zaragoza-Style Grilled Beef Recipe
- Vacuum Sealing Containers: How to Use Them Right
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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