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Creamy Onion Soup from Brasserie Le Coze

I still remember the first time I tried French onion soup. It was at a charming bistro tucked away on a rainy side street during a trip to Paris. The rich, savory broth, the sweet caramelized onions, and that perfectly toasted crouton blanketed in melted Gruyère – it was pure comfort in a bowl. This recipe, adapted from Brasserie Le Coze (now French American Brasserie) in Atlanta, captures that same essence, elevating it with a creamy, luxurious texture that’s simply unforgettable.

Recipe Overview

Prep Time: 20 minutes
Cook Time: 1 hour 45 minutes
Total Time: 2 hours 5 minutes
Servings: 6
Yield: About 8 cups
Dietary Type: Not specified

Ingredients

7 tablespoons butter, divided
1 lb yellow onion, sliced very thinly
2 cups white wine
2 cups heavy cream
1 cup granulated sugar
½ teaspoon water
½ teaspoon lemon juice, freshly squeezed
½ cup sherry wine vinegar
4 tablespoons all-purpose flour
6 cups dark chicken stock or 6 cups beef stock
Salt and pepper to taste

Equipment Needed

Large stockpot
Small saucepan
Separate saucepan
Immersion blender or food processor

Instructions

In a large stockpot over low heat, melt 2 tablespoons butter.
Add the thinly sliced onions and cook, stirring occasionally, until they are very soft and deeply golden brown. This caramelization process is crucial for the soup’s flavor, and it will take approximately 1 hour. Be patient and resist the urge to turn up the heat, as this can burn the onions.
Pour in the white wine and increase the heat slightly. Allow the wine to reduce by half, scraping the bottom of the pot to deglaze any flavorful bits.
Stir in the heavy cream and continue to cook until the cream has also reduced by half, thickening slightly. Keep an eye on it to prevent scorching.
While the onions are caramelizing and the cream is reducing, prepare the gastrique. In a small saucepan, combine the granulated sugar with the water and lemon juice.
Cook over medium heat until the sugar melts and turns into a light caramel color. Watch it carefully, as it can quickly go from golden to burnt.
Remove the caramel from the heat immediately. Allow it to cool briefly, then carefully add the sherry wine vinegar. Be cautious, as the mixture may sputter.
Whisk the vinegar into the caramel to combine. If the mixture hardens, simply set it over low heat to liquefy it again. Set the gastrique aside.
In a separate saucepan, melt the remaining 5 tablespoons butter over low heat. Add the all-purpose flour and whisk constantly for 1 to 2 minutes, or until the flour is fully absorbed by the butter and the mixture is smooth. This mixture, called a roux, should remain blond in color, not brown.
In a separate saucepan, bring the dark chicken stock or beef stock to a boil.
Reduce the heat to low and add the flour roux to the boiling stock, whisking constantly to combine.
Continue to cook, whisking occasionally, until the mixture thickens into a gravy-like consistency.
Use an immersion blender or transfer the mixture to a food processor and puree until smooth. This creates a velouté, a smooth, velvety sauce that forms the base of the soup.
Add the velouté to the pot with the caramelized onions and cream. Stir to combine.
Pour in the prepared sugar-vinegar mixture (gastrique) and stir until it is fully incorporated. The gastrique adds a touch of acidity and sweetness that balances the richness of the soup.
Season the soup to taste with salt and pepper. Remember that the soup will reduce slightly as it simmers, so start with a small amount of seasoning and adjust as needed.
Serve hot. Brasserie Le Coze traditionally served this soup with grated Gruyere cheese, croutons, and green onions for garnish, but it is rich and satisfying enough to enjoy on its own.

Expert Tips & Tricks

Low and Slow for Onions: Caramelizing onions properly requires patience. Avoid rushing the process by using too high heat, as this can burn the onions and result in a bitter flavor. The goal is to draw out the natural sugars in the onions slowly, creating a deep, rich sweetness.
Gastrique Acidity: The gastrique is a crucial element that balances the richness of the soup. Don’t skip it!
Stock Quality Matters: The quality of your stock will significantly impact the final flavor of the soup. Use a good quality homemade or store-bought stock for the best results.
Adjust Sweetness/Acidity: Taste as you go! Adjust the sweetness and acidity of the soup to your liking by adding a touch more sugar or vinegar to the gastrique.

Serving & Storage Suggestions

Serve the Creamy Onion Soup hot, garnished with grated Gruyère cheese, homemade croutons, and thinly sliced green onions for added flavor and texture. For storage, allow the soup to cool completely before transferring it to an airtight container. It can be stored in the refrigerator for up to 3 days. For longer storage, freeze the soup in individual portions for up to 2 months. To reheat, thaw the soup in the refrigerator overnight and gently warm it on the stovetop over low heat, stirring occasionally, until heated through. Avoid boiling, as this can cause the cream to separate.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	723 kcal	N/A
Calories from Fat	412 g	57%
Total Fat	45.8 g	70%
Saturated Fat	27.6 g	137%
Cholesterol	151.5 mg	50%
Sodium	475.1 mg	19%
Total Carbohydrate	57.6 g	19%
Dietary Fiber	1.2 g	4%
Sugars	41.2 g	164%
Protein	9.1 g	18%

Note: Daily values are based on a 2,000 calorie diet. Actual values may vary.

Variations & Substitutions

Vegetarian Option: Substitute vegetable stock for the chicken or beef stock.
Gluten-Free: While the recipe contains flour, it’s used in a roux and can easily be replaced with a gluten-free flour blend. Ensure your stock is also gluten-free.
Dairy-Free: For a dairy-free version, substitute the heavy cream with full-fat coconut milk. The flavor will be slightly different, but still delicious.
Spice it Up: Add a pinch of red pepper flakes to the soup for a touch of heat.

FAQs (Frequently Asked Questions)

Q: Can I make this soup ahead of time?
A: Yes, this soup can be made ahead of time and stored in the refrigerator for up to 3 days. The flavors will actually meld together and improve over time.

Q: Can I use a different type of onion?
A: While yellow onions are recommended for their sweetness, you can use other types of onions such as Vidalia or sweet onions. Avoid using red onions, as they will impart a different flavor to the soup.

Q: How do I prevent the onions from burning while caramelizing?
A: The key is to use low heat and stir the onions frequently. If the onions start to stick to the bottom of the pot, add a tablespoon or two of water to deglaze the pan.

Q: What if I don’t have sherry wine vinegar?
A: You can substitute sherry wine vinegar with apple cider vinegar or white wine vinegar. The flavor will be slightly different, but still work well in the gastrique.

Q: Can I freeze this soup?
A: Yes, this soup freezes well. Allow it to cool completely before transferring it to freezer-safe containers. Thaw in the refrigerator overnight before reheating.

Final Thoughts

This Creamy Onion Soup from Brasserie Le Coze is more than just a recipe; it’s an invitation to savor the simple pleasures of life. The rich, comforting flavors and the velvety texture will warm you from the inside out. Don’t be intimidated by the slightly longer cooking time – the result is well worth the effort. Gather your ingredients, put on some music, and immerse yourself in the process of creating something truly special. I encourage you to try this recipe, share it with loved ones, and let me know what you think! Pair it with a crusty baguette and a crisp glass of white wine for the ultimate dining experience.

Creamy Onion Soup from Brasserie Le Coze Recipe