1. Caramelize the Onions
In a large pot or Dutch oven, heat the olive oil and butter over medium heat.
Add the sliced onions, sugar, and salt. Cook, stirring occasionally, for 30-40 minutes until the onions are deeply caramelized and golden brown.
2. Build the Soup
Add the black pepper to the caramelized onions and stir to combine.
Pour in the beef broth and bring the soup to a simmer.
Let it simmer for 20-30 minutes to allow the flavors to meld.
3. Prepare the Toppings
While the soup simmers, preheat your oven’s broiler.
Slice a baguette into 1-inch thick pieces and toast them lightly.
Grate Gruyère or Swiss cheese for topping.
4. Assemble and Broil
Ladle the soup into oven-safe bowls.
Place a toasted baguette slice on top of each bowl.
Sprinkle generously with grated cheese.
Broil for 2-3 minutes, or until the cheese is melted and bubbly.
5. Serve and Enjoy
Garnish with fresh thyme if desired.
Serve hot and enjoy the rich, comforting flavors!
Tips for Success
Caramelize Slowly: Low and slow is the key to deeply flavorful onions.
Use Quality Broth: Homemade or high-quality store-bought broth makes a big difference.
Add a Splash of Wine: Deglaze the pot with a splash of dry white wine for extra depth.
Make It Ahead: The soup can be made a day in advance and reheated before serving.
Serving Suggestions
This soup is perfect for:
Cozy Dinners: Pair with a simple green salad and crusty bread.
Holiday Meals: Serve as a starter for Thanksgiving or Christmas dinner.
Date Night: Impress your partner with this romantic, hearty dish.
Meal Prep: Store in the fridge for up to 3 days or freeze for longer storage.
Final Thoughts
This Best French Onion Soup is a timeless classic that’s sure to warm your heart and soul. It’s rich, flavorful, and perfect for any occasion. Give it a try and let me know how it turns out in the comments below!