Skip to main content

Classic French Onion Soup

Mama loves this soup. What’s not to love? It’s a hearty bowl of sweet, brown, caramelized onions in a rich beef broth, enriched with a dose of sherry and topped with deliciously nutty, golden brown, melted Gruyère cheese. Why does Gruyère taste so good? Aged, low-moisture cheeses such as Gruyère and Parmigiano-Reggiano have a stronger protein structure than younger, softer cheeses like fontina or fresh mozzarella, and require higher temperatures to melt. The higher heat, combined with less moisture, causes the protein to actually break down, bringing out their nutty flavor.

Recipe information

  • Yield

    serves 4 to 6

Ingredients

4 tablespoons (1/2 stick) unsalted butter
6 onions, preferably Vidalia, sliced
2 leeks, white and pale green parts, well washed (see page 232), halved lengthwise, and thinly sliced into half-moons
1 shallot, chopped
Coarse salt and freshly ground black pepper
1 teaspoon sugar
1 tablespoon all-purpose flour
1/2 cup dry sherry
6 cups beef stock (page 227) or low-fat, reduced-sodium beef broth
1 tablespoon chopped fresh thyme
1 baguette, sliced diagonally 1/2 inch thick
3 cups grated Gruyère cheese (about 12 ounces)
Snipped fresh chives, for garnish

Preparation

  1. Step 1

    To caramelize the onions, in a large, heavy-bottomed Dutch oven, melt the butter over medium-low heat. Add the onions, leeks, and shallot. Season with salt and pepper, sprinkle with sugar, and cook, stirring as needed to keep the onions from sticking, until the onions are melting and soft, golden brown, and beginning to caramelize, 30 to 45 minutes.

    Step 2

    To prepare the soup, sprinkle the flour over the onions, and stir to coat. Add the sherry, stock, and thyme and bring to a boil over high heat. Decrease the heat to low, and simmer, partially covered, for about 30 minutes. Taste and adjust for seasoning with salt and pepper.

    Step 3

    Preheat the broiler. To serve, ladle hot soup into 6 ovenproof bowls. Arrange the bowls on a baking sheet. Place 1 or 2 slices of baguette over each bowl of soup. Top each bowl with 1/2 cup grated cheese so it covers the baguette slices. Broil until the cheese is melted and crusty brown around the edges. (Watch carefully so the bread doesn’t burn.) Garnish with the chives. Serve immediately.

  2. sherry

    Step 4

    Sherry is a fortified wine from the town of Jerez de la Frontera, in the Andalusia region of Spain. Sherries can range in flavor from sweet to dry, and are served either at room temperature or chilled. Sherry is an excellent apéritif and adds a lively punch in cooking, where it is typically added as a finish for soups.

Cover of Bon Appetit, Yall by Virginia Willis featuring a serving of corn souffle.
From Bon Appétit, Y’all: Recipes and Stories From Three Generations of Southern Cooking, © 2008 by Virginia Willis. Reprinted by permission of Ten Speed Press. Buy the full book from Amazon or Abe Books.
Read More
Khao niaow ma muang, or steamed coconut sticky rice with ripe mango, is a classic in Thai cuisine—and you can make it at home.
With just a handful of ingredients, this old-fashioned egg custard is the little black dress of dinner party desserts—simple and effortlessly chic.
With rich chocolate flavor and easy customization, this hot cocoa recipe is just the one you want to get you through winter.
This classic 15-minute sauce is your secret weapon for homemade mac and cheese, chowder, lasagna, and more.
Crunchy and crowd-pleasing, this salad can be prepared in advance and customized to your heart’s content.
Baking meatballs and green beans on two sides of the same sheet pan streamlines the cooking process for this saucy, savory dinner.
Make this versatile caramel at home with our slow-simmered method using milk and sugar—or take one of two sweetened condensed milk shortcuts.
A garlicky pistachio topping takes this sunny summer pasta from good to great.