French Onion Soup with an Italian Twist

Loriana Shea

French Onion Soup with an Italian Twist

French onion soup has always felt like the ultimate comfort food to me, but I can’t help adding an Italian touch to the dishes I love most. In my kitchen, onions are never rushed—they’re slowly caramelized the way I learned growing up, filling the house with that unmistakable, cozy aroma that signals something special is coming. For this version, I use a mix of red onions, yellow onions, and leeks, then finish the soup the Italian way—with herb focaccia and freshly grated Fontina instead of the classic baguette and Gruyère. It’s familiar yet different, rustic but comforting, and exactly the kind of soup I make when I want something simple, soulful, and meant to be shared.

Things to know about this French Onion Soup with an Italian Twist

A mix of yellow onions, red onions, and leeks adds natural sweetness and depth without needing sugar.
Fontina melts smoothly and stays creamy, making it a perfect Italian alternative to Gruyère.
Herb focaccia absorbs the broth while still holding its shape, giving you that perfect bite every time.
The soup base can be made a day ahead; add the focaccia and cheese just before serving for best texture.
Storage: Store leftover soup (without focaccia or cheese) in an airtight container in the refrigerator for up to 4 days.
Freezing: This soup freezes well without the bread and cheese. Freeze in freezer-safe containers for up to 3 months. Thaw overnight in the refrigerator and reheat on the stovetop before adding toppings.
Always add the focaccia and Fontina fresh just before broiling for the best texture and flavor.
If you love classic comfort food with an Italian twist, this French Onion Soup with an Italian Twist is a must-try. The combination of caramelized onions, leeks, herb focaccia, and melty Fontina makes it a cozy, flavorful soup perfect for any season.

For more hearty Italian soups, explore my Creamy Sausage Tortellini Soup or Potato Leek Soup with Pancetta—both are easy to make and full of rich, comforting flavors.

Want to try more Italian-inspired weeknight recipes? Don’t miss my Italian sausage Escarole and Beans or Spinach Ricotta Balls for quick, flavorful meals the whole family will love.

Remember to save this French Onion Soup recipe for later and follow my blog for more Italian cooking inspiration delivered right to your inbox!

French Onion Soup with an Italian Twist

Prep Time

15 minutes

Cook Time

1 hour 10 minutes

Total Time

1 hour 25 minutes

Servings

4–6

Ingredients

Soup

2 tablespoons olive oil
2 tablespoons unsalted butter
2 large yellow onions, thinly sliced
2 medium red onions, thinly sliced
2 large leeks, white and light green parts only, thinly sliced and well rinsed
1 teaspoon salt, plus more to taste
½ teaspoon freshly ground black pepper
2 cloves garlic, minced
¼ cup dry white wine
6 cups beef broth (or chicken broth for a lighter version)
1 teaspoon fresh thyme leaves (or ½ teaspoon dried)
1 bay leaf

Topping

4–6 slices herb focaccia
1½ cups freshly grated Fontina cheese

Instructions

Caramelize the onions
In a large heavy-bottomed pot or Dutch oven, heat the olive oil and butter over medium heat. Add the yellow onions, red onions, and leeks. Sprinkle with salt and pepper. Cook, stirring occasionally, for 35–40 minutes, until deeply golden, soft, and caramelized. Reduce heat if needed to prevent burning.
Build the flavor
Add the garlic and cook for 1 minute until fragrant. Pour in the white wine, scraping up any browned bits from the bottom of the pot. Simmer for 2–3 minutes until slightly reduced.
Simmer the soup
Add the broth, thyme, and bay leaf. Bring to a gentle simmer, cover partially, and cook for 25–30 minutes. Taste and adjust seasoning. Remove the bay leaf.
Prepare for broiling
Preheat the broiler. Ladle the soup into oven-safe bowls and place them on a baking sheet.
Add the Italian topping
Top each bowl with a slice of herb focaccia, then generously sprinkle with Fontina cheese.
Broil
Broil for 2–4 minutes, until the cheese is fully melted, bubbling, and lightly golden. Watch closely.
Serve
Serve immediately, hot and bubbling, with extra focaccia on the side if desired.