French Onion Soup

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This French Onion Soup recipe combines sweet caramelized onions, rich beef stock, and Gruyere-topped bread for a hearty, comforting dish. The optional veal demi-glace adds a luxurious depth of flavor. Perfect for a cool fall evening.

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Prep Time:10

Cook Time:2 10

Total Time:2 20

Course: Soup

Cuisine: French

Keyword: Bread, Gruyère, Onions

Servings: Servings

Calories: 559kcal

Author: Laura Booras

Ingredients

2 tablespoons butter
2 tablespoons olive oil
2 pounds sweet onions, thinly sliced
1 teaspoon sugar
2 cloves garlic, minced
4 sprigs thyme
2 tablespoons flour
½ cup white wine
1 quart beef stock
2 tablespoons veal demi-glace, optional
2 cups Gruyere cheese, grated
4 half slices Bob's Pain aux Lardons

Instructions

In a heavy-bottom cast-iron pot, melt the butter and olive oil together until hot. Add the onions and sugar and cook down slowly, keeping the heat on medium or medium-low. As they cook and soften, scrape up the browned bits and stir so that they don’t burn. Cook the onions until they are golden brown, about an hour and a half.
When the onions are soft and brown, add the garlic and thyme, then add the flour. Cook 2 minutes. Add the white wine and cook until it is completely evaporated, stirring constantly. Add the stock and demi-glace and stir to combine. Bring to a simmer and cook slowly for about 30 more minutes.
Preheat the broiler.
Remove the thyme sprigs. Pour the soup into 4 small oven-proof bowls on a lined baking sheet. Top with a slice of bread and then a generous mound of cheese. Put under the broiler until the cheese bubbles and browns.

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