Flemish Onion Soup (Soupe à l'Oignon Flamande)

Soupe à l'Oignon Flamande, or Flemish Onion Soup, is a classic Belgian dish that is hearty, flavorful, and perfect for a cozy meal. This traditional soup is made with caramelized onions, beef broth, and a topping of crusty bread and melted cheese.

Gluten Free Dairy Free Optional If Using Dairy Free Cheese Soup Belgian Belgian Cuisine Onion Comfort Food
Flemish Onion Soup (Soupe à l'Oignon Flamande)

Ingredients

  • 4 large onions, thinly sliced
  • 3 tablespoons unsalted butter
  • 2 tablespoons all-purpose flour
  • 6 cups beef broth
  • 1 teaspoon sugar
  • Salt and pepper to taste
  • 4 slices of crusty bread
  • 1 cup grated Gruyère cheese

Instructions

  1. In a large pot, melt the butter over medium heat. Add the sliced onions and cook, stirring occasionally, until the onions are caramelized and golden brown, about 30-40 minutes.
  2. Sprinkle the flour over the caramelized onions and cook for an additional 2-3 minutes, stirring constantly.
  3. Pour in the beef broth and bring the soup to a simmer. Add the sugar, salt, and pepper. Let the soup simmer for 20-30 minutes.
  4. Preheat the broiler. Ladle the soup into oven-safe bowls. Top each bowl with a slice of crusty bread and a generous amount of grated Gruyère cheese.
  5. Place the bowls under the broiler for 2-3 minutes, or until the cheese is melted and bubbly.
  6. Serve the Soupe à l'Oignon Flamande hot and enjoy!

Cooking & Preparation

Preparation time:
15 minutes
Cooking time:
1 hour
Total time:
1 hour
Cooking method
Stovetop

Nutritional facts per 1 serving

Calories
250 per serving
Carbohydrates
30g
Protein
15g
Fat
8g

Supplies

Large pot Ladle Oven-safe bowls

Tools

Knife Cutting board Stovetop Oven

Serving suggestions

Serve the Soupe à l'Oignon Flamande with a side of mixed greens or a slice of Belgian beer bread for a complete meal.

Tips & tricks

For a richer flavor, you can add a splash of Belgian beer to the soup while simmering.

Cost

$10