
Turning classic French onion soup into a filling pasta creation makes for the ultimate comfort dish. This single-pot French onion pasta combines wonderfully sweet, slow-cooked onions with perfectly tender mezze rigatoni, all wrapped in a creamy, Gruyere-infused sauce that brings all the fantastic flavors of the traditional French soup right to your table.
I've cooked this so many times now and found it's just right for those cold nights when you want something fancy but can't be bothered dealing with tons of cookware. My kids now actually like this more than the original soup - they really go for how the pasta soaks up every bit of that amazing flavor.
Key Ingredients and Shopping Guidance
- Yellow Onions: Go for ones that feel heavy and have bright, thin outer skins. Yellow onions naturally caramelize beautifully thanks to their sugar content.
- Mezze Rigatoni: This compact pasta shape has great grooves that grab onto the sauce. Try to find pasta made with bronze dies for the best texture.
- Gruyere Cheese: Don't cut corners here - get good aged Gruyere for its rich, nutty taste. Always shred it yourself right before using.
- Beef Bone Broth: Look for one that's dark in color with loads of flavor. The gelatin in bone broth will give your sauce an amazing silky feel.
- Sherry and White Wine: These aren't just fancy extras - they scrape up all the tasty bits and add important flavor layers. Pick dry ones you'd happily drink.
Step-by-Step Cooking Guide
- 1. Getting Started with Onions:
- - Cut onions lengthwise (root to tip) about 1/8 inch thick so they won't fall apart during cooking.
- Warm up avocado oil in a sturdy Dutch oven until it's slightly rippling.
- Toss in onions with salt and water to help them soften up evenly before they start browning. - 2. Nailing the Browning Process:
- - After the water cooks off, keep heat at medium-low so they don't burn.
- Give them a good stir every 5-7 minutes, making sure to scrape the bottom. Watch as they change from white to light gold to deep amber.
- You'll see them shrink down a lot - that's all the flavor getting more concentrated.
- Once they're a rich golden color, pour in sherry and wine to loosen all the tasty bits. - 3. Adding the Pasta Elements:
- - Put pasta and liquids right into the same pot - the pasta starch will naturally thicken your sauce.
- Watch your liquid carefully and stir often to keep everything from sticking.
- Check the pasta regularly - you want it just a tiny bit firmer than al dente. - 4. Bringing It All Together:
- - Turn down the heat before you add cheese so it melts smoothly without getting grainy.
- Pour in the half & half bit by bit, checking how thick the sauce is as you go.
- Let everything sit together for 2-3 minutes before serving so flavors can mix properly.

Coming from a family with French cooking influences, I've always loved how onions change when you cook them slowly. The deep, sweet flavor they develop is truly something special - that's why I use them so much in my cooking.
Taking It Up A Notch
- Want it even richer? Drop in a chunk of butter when you add the half & half.
- Always do the deglazing step - those stuck-on brown bits pack tons of flavor.
- Adding some fresh thyme right before serving really wakes up all the flavors.
I've made this dish for years and still can't get over how such basic ingredients turn into something so fancy. Just remember to be patient with those onions - they're really what makes this dish shine.

What I love most about this dish is how it turns everyday ingredients into something that works for both fancy dinners and family meals. It's become my favorite thing to make when I want to show someone how amazing simple food can be with just a bit of time and love.
Frequently Asked Questions
- → Why does caramelizing onions take so long?
- It takes time to get that deep sweetness from caramelized onions, which makes the dish flavorful.
- → Can I change the pasta type?
- Sure, just use medium-size pasta and tweak the cooking time if needed.
- → What replaces gruyere cheese best?
- If you don't have gruyere, try Swiss or fontina—they melt well and taste great here.
- → Do I have to use wine?
- No. Swap wine for extra broth, but keep in mind it might taste a little different.
- → How do I stop pasta from sticking?
- Make sure to stir often and add extra liquid as needed during cooking.