French Onion Soup in Bangkok: The Brasserie Classic at Brasserie 9

Quick answer: The French onion soup Bangkok diners can order at Brasserie 9 is the Gratinated French Onion Soup with Comté cheese, listed at ฿420 on the à la carte menu and marked as a chef’s recommendation (menu checked 31 October 2026). Brasserie 9 is at 27 Soi Sathorn 6, a few minutes on foot from BTS Chong Nonsi or Sala Daeng, and opens daily from 11:30 to midnight. Book on Chope or call 02 234 2588.

French onion soup Bangkok: the Brasserie 9 version

On the Brasserie 9 à la carte menu, the soup sits with the starters as “Gratinated French Onion Soup, Comté Cheese”. The menu gives it the chef’s recommendation mark, which only some dishes carry.

• Gratinated. The cheese is baked on top of the soup until it browns, so the bowl reaches the table with a golden crust. The restaurant’s own photos show the crust bubbling over a white lion-head bowl on a Brasserie 9 saucer.
• Comté cheese. Comté is a firm French cow’s-milk cheese from the Jura region. It melts into long strands, which you see when the spoon breaks the crust.
• Price. ฿420 (menu, 31 October 2026). A 10% service charge applies.

What makes French onion soup different from other onion soups?

Many onion soups are a light broth with onions in it. The classic French version is built in layers:

• Slow-cooked onions. The onions cook gently in butter for a long time until they turn deep brown and sweet.
• A rich stock. The onions then simmer in stock, which gives the soup its dark colour.
• Bread and cheese on top. A slice of toasted bread goes on the soup, cheese goes over the bread, and the bowl goes under high heat until the cheese melts and browns. In French this finish is called gratinée.

The Brasserie 9 menu does not list the stock or the cooking time. If you have a dietary question, ask the team before you order.

What to order with French onion soup at Brasserie 9

The soup is a starter, so it opens a full French meal. These dishes are on the same menu (prices in Thai baht, checked on the restaurant’s website on 31 October 2026):

A three-course meal of the onion soup, the Duck Leg Confit and the Tarte Tatin comes to ฿1,750 at menu prices, before drinks and charges on the bill. More dishes are in the guide to Brasserie 9’s signature French dishes.

Why onion soup belongs on a brasserie menu

A brasserie serves classic French dishes in a relaxed dining room, and onion soup is a standard dish on brasserie menus in France. Brasserie 9 is a two-storey restaurant that serves its menu brasserie-style, with The Brass cocktail bar inside. For the story of the format, read what a brasserie is.

The kitchen is led by Chef de Cuisine Hervé Frérard. He was born and trained in France, and his thirty-year career has taken him across Europe and Asia. He has cooked for Queen Elizabeth II and President François Mitterrand. Read more in Chef Hervé Frérard: thirty years of French cooking, now in Sathorn.

Hours, contact and booking

• Address. 27 Soi Sathorn 6, Silom, Bang Rak, Bangkok 10500. You can also enter from Silom Soi 3. Open in Google Maps.
• Hours. Open daily, 11:30 to 00:00. For a late table, ask for the kitchen’s last order when you book.
• Getting there. BTS Chong Nonsi or Sala Daeng, a few minutes on foot. Guests get complimentary parking, first come, first served.
• Reviews. 4.7 on Google from more than 1,000 reviews (checked 29 September 2026).
• Book. Reserve a table on Chope or call 02 234 2588.

Frequently asked questions

1. What is another name for French onion soup?
   In French it is soupe à l’oignon. When the soup is finished with toasted bread and a baked cheese crust, it is often called soupe à l’oignon gratinée, which is why the Brasserie 9 menu lists it as Gratinated French Onion Soup.
2. Is French onion soup vegetarian?
   Not always. Many classic recipes use beef stock, and the Brasserie 9 menu does not say which stock its kitchen uses. If you eat vegetarian, ask the team when you order. The restaurant says it offers a selection of vegetarian and vegan dishes.
3. Does Brasserie 9 serve another soup?
   Yes. The starters also include Classic Lobster Bisque Soup with a crispy feuillet and sour cream at ฿520 (menu, 31 October 2026), for guests who prefer a seafood soup to the onion soup.
4. Can I walk in, or do I need to book?
   Walk-ins are welcome, according to the restaurant’s own FAQ. Booking is still recommended on weekends and for special occasions, and you can reserve online through the restaurant’s website or Chope.
5. Can I bring children?
   Yes. Brasserie 9 welcomes families and children, and the restaurant states that it is wheelchair accessible. Pets are welcome in the outdoor seating area, so the whole family can come along.