French Onion Fondue

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This French onion fondue recipe turns classic French onion soup into a fun meat fondue dinner with savory broth, steak, chicken, vegetables, potatoes, and Gruyère toasted bread for dipping.

A silver fondue pot with French onion fondue in it. A hand is dipping a toasted baguette slice into the fondue. The pot is surrounded by toasted baguette slices with melted cheese.

Enjoy a night with your family or guests with a memorable experience. If you love French onion soup, this fun twist turns those same caramelized onion and Gruyère flavors into an interactive fondue dinner.

You’ll be cooking tender bites of steak, vegetables, potatoes, and cheesy Gruyère toast in a rich French onion broth. It’s great for Valentine's Day, New Year's Eve, Christmas, anniversaries, or dinner parties.

Ingredients

Unsalted Butter
Olive Oil
Large Yellow Onions
Salt
Granulated Sugar
Beef Stock or Broth
Dry White Wine
Fresh Thyme Leaves
Black Pepper
Bay Leaf
Cognac, optional
French Baguette
Gruyère Cheese

How to Make French Onion Fondue

A dark gray cutting board with sliced yellow onions and a knife sitting on it.

A large Hexclad skillet with sliced yellow onions cooking in it.

Caramelize the onions. Melt the butter and olive oil in a pot set over medium-low heat on the stovetop. Add the onions and cook, stirring occasionally, for about 15 minutes, until softened. Sprinkle in the sugar and continue cooking, stirring occasionally, for another 25 to 30 minutes, until deeply browned and jammy. Drain grease, if needed. Season lightly with the salt and black pepper.

A baking sheet with slices of baguette on it.

A baking sheet with sliced baguette topped with shredded Gruyere.

Bake the cheese toasts. While the onions cook, make the toasts. Preheat oven to 400°F. Arrange baguette slices in a single layer on a baking sheet. Toast for 4 to 6 minutes, or until the bread is lightly crisp and golden around the edges. Remove the bread from the oven and sprinkle each slice with Gruyère cheese. Return the baguette slices to the oven and bake for 3 to 4 minutes, or until the cheese is melted and bubbly.

A Hexclad skillet with French onion fondue broth in it and a bay leaf sitting on the surface of the liquid. It's sitting on a black stovetop.

Build the broth. Slowly add dry white wine and cognac, if using, to the onions. Scrape up any browned bits from the bottom of the pot. Add beef broth, thyme, black pepper, and bay leaf directly into the pot with the onions. Bring to a gentle simmer for 10 minutes so the flavors meld.

An overhead view of a silver fondue pot filled with French onion fondue. A wood rectangle platter has baby potatoes, mushrooms, broccoli, and a small white bowl of steak cubes. A wood cutting board at the bottom of the photo has ravioli in a white bowl and toasted baguette slices topped with melted Gruyere. A small wooden bowl of fresh thyme sits next to the pot. Silver fondue forks sit to the right of the fondue pot.

Serve. Pour the broth into the fondue pot (if not already there) to keep the broth at a steady simmer. Guests spear cubes of steak or chicken on fondue forks and cook them directly in the hot broth. Dip crunchy pieces of gruyère toasts into the broth. Add potatoes and mushrooms to the pot to cook on their own, then remove with a slotted spoon once they’re done.

Fondue Etiquette

Use a clean fork for eating. Traditional fondue forks are used to cook food in the pot, but avoid putting the fork you eat with directly back into the shared broth. Use the fondue fork or skewer to cook your food, then transfer it to your plate before eating.

Keep raw meat separate. Use separate plates or bowls for raw meat and cooked foods. Avoid placing cooked food back on the same plate that held raw meat.

Be patient. Fondue is meant to be enjoyed slowly. It's not a meal to rush through. Take your time cooking, dipping, and chatting.

Don't double dip. Since everyone shares the same pot, avoid dipping food that has already been bitten into back into the broth.

Give everyone two forks. Each person should receive two fondue forks of the same color to cook two food items at a time. Keep track of your color so you don’t swap with your neighbor.

A closeup of a silver fondue pot filled with French onion fondue and four fondue forks with food on them being held over the pot. A wood platter in the background has a bowl of cubed steak, broccoli, baby potatoes, and mushrooms. Another white bowl of ravioli sits behind the pot.

FAQ

What is French onion fondue?

French onion fondue is a broth-based fondue inspired by classic French onion soup. Instead of dipping bread into melted cheese, bite-sized pieces of meat and vegetables are cooked in a flavorful caramelized onion broth. Gruyere-topped baguette slices are served alongside to recreate the iconic cheesy French onion soup topping.

What kind of meat is best for fondue?

The best meats for fondue are tender cuts that cook quickly, such as top sirloin, ribeye, New York strip, or tenderloin. Top sirloin is a great choice because it is flavorful, tender, and more affordable than premium cuts. Chicken can also be used as a lighter alternative.

How much meat do you need per person for meat fondue?

Plan on about 5 to 6 ounces of meat per person when serving fondue with other dippers like potatoes, vegetables, and bread. If meat is the main focus of the meal, you can increase the amount to about 6 to 8 ounces per person.

What can you dip in French onion fondue?

Popular French onion fondue dippers include steak, chicken, baby potatoes, mushrooms, broccoli, and Gruyere-topped baguette slices. Other options include Brussels sprouts, asparagus, shrimp, or other bite-sized vegetables and proteins.

What temperature should broth fondue be?

Broth fondue should be kept hot enough to cook the meat gently. Maintain a simmering temperature rather than a rapid boil, which can make the broth evaporate too quickly and cause uneven cooking.

A closeup of a silver fondue pot filled with French onion fondue and with four fondue forks in the liquid. A wood platter in the background has a bowl of cubed steak, broccoli, baby potatoes, and mushrooms. Another white bowl of ravioli sits behind the pot.

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