Onion and Fennel Soup Gratin

Ellen Whiteman

Onion and Fennel Soup Gratin is a comforting French dish that combines the flavors of onions and fennel in a delicious soup topped with a cheesy gratin. It is a perfect choice for those following a keto or gluten-free diet.

Signup to Dinnerfy to explore more

Sign up
🌾 Gluten Free
Comfort Food

10 mins

28 mins

Nutritional Value

fats - unknown
protein - unknown
carbs - unknown


Total: 13Serves: 4
4 tbsp Butter

½ stick unsalted

1/4 cup Olive Oil


3 lbs Spanish Onions

halved and sliced ¼ inch thick

2 lbs Fennel

tops and cores removed, sliced ¼ inch thick

1/2 cup Dry Sherri


1/2 cup Cognac or Brandy
3/2 cups Dry White Wine

good, such as Sauvignon Blanc

8 cups Canned Beef Broth
3 Bay Leaves
1 tbsp Kosher Salt
3/2 tsp Black Pepper

freshly ground

1 small Sourdough or White French Boule

crusts removed, sliced ½ inch thick, and toasted

Gruyère Cheese



Step 1 : Preparation

Halve and slice the Spanish onions ¼ inch thick. Remove the tops and cores from the fennel and slice it ¼ inch thick. Remove the crusts from the sourdough or white French boule and slice it ½ inch thick. Grate the Gruyère cheese.

Step 2 : Cooking

Heat the butter and olive oil in a large stockpot over medium-high heat. Add the onions and fennel, and cook over medium heat for 30 to 40 minutes, stirring occasionally, until the onions turn a golden brown. If the onions aren't browning, turn the heat up. Add the sherry and Cognac, scraping up the brown bits in the pan, and simmer uncovered for 5 minutes. Add the white wine and simmer uncovered for 15 more minutes. Add the beef broth, bay leaves, salt, and pepper, bring to a boil, lower the heat, and simmer uncovered for 20 minutes. Remove the bay leaves and taste for seasoning.

Step 3 : Gratin

Preheat the broiler and position a rack 5 inches below the heat source. Ladle the soup into heat-proof serving bowls, top with the toasted bread, sprinkle generously with grated Gruyère, and broil for 3 to 5 minutes, until the cheese is melted and bubbly.

Step 4 : Serve

Serve the Onion and Fennel Soup Gratin hot.

User Ingredient

User Instructions