Parisian Golden Onion French Bistro Soup
A luxurious French classic featuring deeply caramelized onions slowly simmered in a rich beef broth infused with herbs and finished with toasted artisan bread and a blanket of melted Gruyère cheese. This gourmet French Onion Soup captures the warmth of a traditional Parisian bistro with layers of sweet, savory, and complex flavors in every spoonful.
Parisian Golden Onion French Bistro Soup
shopping_basketIngredients
- Yellow Onions5 large (about 3 lbs), thinly sliced
- Unsalted Butter4 tbsp
- Extra Virgin Olive Oil2 tbsp
- Garlic4 cloves, minced
- Dry White Wine1 cup
- Beef Broth6 cups
- Fresh Thyme6 sprigs
- Bay Leaves2
- Worcestershire Sauce1 tbsp
- Balsamic Vinegar1 tbsp
- French Baguette1 loaf, sliced into 1-inch pieces
- Gruyère Cheese3 cups, freshly shredded
- Parmigiano-Reggiano1/2 cup, freshly grated
- Fine Sea Salt2 tsp
- Freshly Ground Black Pepper1 tsp
Nutrition Per Serving
Calories
420
Protein
18g
Fat
23g
Carbs
36g
restaurantInstructions
Prepare the Onions
Peel and thinly slice the onions evenly using a sharp knife or mandoline. Consistent slices help the onions caramelize at the same rate.
Avoid slicing onions too thin, as they can burn before developing their deep caramelized flavor.
Begin Caramelizing
Heat butter and olive oil in a large heavy-bottomed pot over medium heat. Add the sliced onions and a pinch of salt. Cook uncovered for 15 minutes, stirring occasionally, until the onions soften and release moisture.
Deeply Caramelize the Onions
Reduce heat to medium-low and continue cooking for 45 to 55 minutes, stirring every few minutes, until the onions become deeply golden brown and jammy. Add small splashes of water if the onions begin sticking.
Great French onion soup depends on patience. Slow caramelization creates the natural sweetness and rich flavor of the dish.
Add Garlic and Deglaze
Add the minced garlic and cook for 30 seconds until fragrant. Pour in the white wine and scrape the bottom of the pot to release the flavorful caramelized bits. Simmer for 5 minutes until slightly reduced.
Build the Soup Base
Add the beef broth, thyme sprigs, bay leaves, Worcestershire sauce, balsamic vinegar, salt, and black pepper. Bring to a gentle simmer and cook uncovered for 25 minutes to allow the flavors to combine.
A small amount of balsamic vinegar enhances the onions' sweetness and adds complexity without making the soup taste acidic.
Prepare the Bread
While the soup simmers, preheat the oven to 400°F (200°C). Arrange baguette slices on a baking sheet and toast for 8 to 10 minutes until crisp and golden.
Prepare the Cheese Topping
Combine the shredded Gruyère and grated Parmesan cheese in a bowl. Set aside for assembling the soup.
Assemble the Bowls
Remove the thyme stems and bay leaves from the soup. Ladle the hot soup into oven-safe bowls. Place toasted baguette slices on top and generously cover with the cheese mixture.
Using oven-safe bowls allows the cheese to melt directly over the soup for the classic bistro presentation.
Broil Until Golden
Place the bowls under the broiler for 2 to 4 minutes until the cheese is melted, bubbling, and beautifully browned. Watch carefully to avoid burning.
Serve and Store
Serve immediately while the cheese is hot and stretchy. Store leftover soup without the bread and cheese topping in an airtight container in the refrigerator for up to 4 days. Reheat gently on the stovetop and prepare fresh cheesy toast before serving.
French onion soup often tastes even better the next day because the caramelized onion flavors continue to develop.
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