Onion and Blue Cheese Tart

This onion and blue cheese tart is a savory pie made with roasted cipollini or pearl onions, a rich ricotta filling, and a creamy blue-cheese royale (translation: filling).

An onion and blue cheese tart cut into wedges with crispy onions scattered around it.

Don’t look at the long list of ingredients for this onion and blue cheese tart and think for a minute this is a difficult recipe. Because it’s not. It’s without a doubt one of the finest recipes on LC. I’ve made it for what seems like a ballroom full of guests and no one can ever seem to get enough.

I do have one small caveat, though. Bleu de Gex isn’t the easiest cheese to find. Do some investigative work in your local markets, because the difference it makes is noticeable. If you can’t find it, Stilton subs nicely.–David Leite

What is Bleu de Gex cheese?

Bleu de Gex cheese. Wondering what the heck is that? To be truthful, we asked ourselves the same thing the first time we encountered this recipe. More importantly, we also asked where can we find it? A scouring of New York City cheese shops left us empty-handed. (Well, not really, as we had a refrigerator full of some truly lovely cheeses…) If, like us, you can’t find the marvelous Bleu de Gex cheese, fret not. You can order it online. Or you can substitute Bleu d’Auvergne (another elusive cheese) or good old Stilton. Trust us, your tart will still be delicious, creamy, and requested time and again by friends and family.

Onion and Blue CheeseTart

  • Quick Glance
  • (5)
  • 30 M
  • 2 H, 15 M
  • Serves 8 to 10
5/5 - 5 reviews

Special Equipment: 10-inch (25-cm) tart pan with a removable bottom


  • For the onions
  • For the tart dough
  • For the filling
  • For the royale


Prep the onions

Preheat the oven to 350°F (175C°).

In a small bowl, toss together the onions, olive oil, rosemary, sage, thyme, salt, and pepper. Spread the mixture in a single layer on a rimmed baking sheet and roast until the onions are softened and begin to color but still hold their shape, 45 minutes. 

Tester tip: If you used our nifty peeling trick for cipollini onions found beneath the recipe, you may find you can reduce the roasting time by as much as 15 minutes since the onions have been partially cooked.

Place the baking sheet on a wire rack to cool. Increase the oven temperature to 375°F (190°C) and adjust the oven rack to the middle position.

Make the tart dough

Dump the flour and salt in the bowl of a food processor and pulse to combine. Add the butter and pulse until the mixture resembles small peas, about 10 one-second pulses. While pulsing the mixer, drizzle 3 tablespoons ice water through the feed tube until the dough starts to come together. If the dough isn’t coming together, add the remaining water, 1 tablespoon at a time. Don’t overmix the dough.

Transfer the dough to a lightly floured work surface and form it into a disc with your hands. Roll out the dough into a 13-inch circle, then ease it into a 10-inch tart pan, fitting it snugly against the sides and bottom, and trim the excess. Prick the bottom of the tart with a fork and refrigerate for 30 minutes.

Make the filling

In a small bowl, whisk the ricotta, egg yolk, and olive oil until smooth. Stir in the crème fraîche and season with salt and pepper.

Make the royale

Whisk the egg, flour, and salt in a small bowl. Heat the cream and milk in a small saucepan until hot but not boiling, then slowly add it to the egg and flour mixture, whisking until smooth. Stir in the crème fraîche.

Assemble the tart

Spread the filling evenly in the tart shell. Scatter 3/4 of the onions in the tart shell and drizzle with the royale. Arrange the slices of cheese on top. Dot with the remaining onions.

Bake the tart for 30 minutes, rotating it 180° after 15 minutes. 

Loosely cover the tart with foil and bake for another 15 minutes. If the pastry needs more color, increase the heat to 400°F (200°C), uncover the tart, and bake for 10 to 15 more minutes. 

Cool the tart in its pan on a wire rack for at least 5 minutes. Slice and serve. Originally published April 18, 2005.

    *How to peel cipollini onions

    • The one downfall of cipollini onions is that if you don’t know how to properly peel them, this can take forever. We suggest you cut off the root end on each onion and then drop them in boiling water for 2 minutes. The peels will slip off much more readily than trying to wrestle with the papery skins. If you use this trick, shared with us by recipe tester Nadine Bonda, you may be able to decrease the time to roast the onions from 45 minutes to 30 minutes because they’re already partially cooked.

    David Says

    David Leite caricature

    Can we tawk? Just us two cooks? I know, I know. You look at a recipe like this, with all its components, and you think, "Have you been smoking more grass clippings, David?" Some of the ingredients (I'm talking to you, cipollini onions) can be hard to find. Then, of course, there's bleu de Gex. You may have never heard of it. And it ain't in your local supermarket. And what in the hell is a royale?!

    I hear you. But you've got to hear me: This recipe is worth every inch of exertion it may cause as well as the frustration and cost of finding bleu de Gex. Do you want to know how good this recipe is? There were times The One and I were on rocky ground--I mean that should-we-break-up?! ground--and this recipe was part of our reconciliation dinner. (We're still together after 27, years, so there's your proof!) And when I needed to impress a cookbook editor and potential TV producers, I whipped up this recipe. They left impressed. (Though I still don't have a TV show...)

    Please consider making this. It will challenge you, delight you, and make you fall off the dining chair--it's that good.

    Recipe Testers' Reviews

    This onion and blue cheese tart is well worth the time it takes. It's not only beautiful but it tastes divine. The filling is unlike a quiche filling in that it has more texture and taste with the addition of ricotta cheese and rème fraîche. The sweet taste of the lovely cipollini onions in combination with the bleu cheese is perfect. I served it for Sunday night dinner and it was a hit, described as "this is definitely a make again."

    The one downfall of cipollini onions is that if you don't know how to peel them, they can take forever. I cut off the root end on each then dropped them in boiling water for 2 minutes. This allowed me to pull off the skin in a much shorter time. Also, because the onions were now partially cooked, I was able to cut the time to roast the onions from 45 minutes to 30 minutes. Both of these steps were a plus in doing a multi-step dish.

    I used Bleu d'Auvergne cheese. I baked the completed tart for 30 minutes, but I did it on the middle rack in my oven to help it brown a little faster. It was perfect. It was nicely golden on the top and had a firm texture. I served it alone as dinner and found that it served two of us with an additional serving left for lunch tomorrow. 


    #leitesculinaria on Instagram If you make this recipe, snap a photo and hashtag it #LeitesCulinaria. We'd love to see your creations on Instagram, Facebook, and Twitter.


      1. Debbie, you want a strong-flavored cheese here that would have a similar texture. If you don’t like any variety of blue cheese, feta might work in its place.

    1. I am an absolute freak for blue cheese, any and all of them! I will find Bleu de Gex and I will make this and I will be bowled over by it. The cheese shop in the village would love the challenge of finding this cheese, although I don’t know how successful the search will be. At any rate, I can always improvise and Stilton is in their cheese case. This recipe brings to mind the leek and blue cheese tart recipe from the WaPo back in the 90s, Renee do you know it?

      1. Ah, Lisa, that does sound familiar. Granted, there were hundreds of recipes from that time but I do recall that as being incredibly popular. I think my fave recipe from my WaPo days, though, was a chilled corn soup with coconut milk and a hint of coriander and cumin that came from Saveur magazine…indescribable.

    2. I found this recipe just now as it was mentioned in David’s Halloween blahg. I can’t even believe that you know about “bleu de Gex”!!!!! Gex is a tiny, fairly ugly nowhere place at the foot of the Jura mountains, on the French/Swiss border, just outside Geneva (where I live). It is known by locals as that it where everyone in the area on the French side of the border has to go to take their driving test. The two best things about Gex are the fabulous view of the Mont Blanc, and their, as I have just discovered famous blue cheese. I am not surprised though that it is hard to get hold of as I think their annual production can only be about 3kgs. (Only joking for those French cheese makers reading this blog….) It is however delicious and one of my favourite blue cheeses and I am definitely going to try this recipe this week!

      1. Tamara, yes, it is a marvelous cheese! To be completely frank, I’d never heard about it until Suzanne Goin, the chef, mentioned it to me. I simply HAD to get my hands on it to make the recipe. I hope you like the tart!

    3. This is one of the best-looking tarts I’ve ever seen. And the combination of cipollini onions with blue cheese is amazing. The flavors and ingredients melt together beautifully. Using a mild blue cheese allows it to take on a subtlety when baked so it doesn’t overwhelm the onions. It’s brilliant. I’ve just made it again after a few years and it’s definitely legit! I’m a quiche fanatic, and this one is maybe the best I’ve found. This is one of those best-kept secret recipes on the internet.

      1. Not going to argue with you, jtrevino99. That’s why we test a recipe over and over and over again before deciding whether it is worthy of our readers’ time and ingredients and expectations. I so appreciate you taking the time to share your experience and enthusiasm, and I look forward to hearing which recipes from the site you try next!

    4. I popped over here from Claire´s post at Promenade Plantings. Oh my, so glad I did! What an amazing looking and sounding tart. Can’t get that cheese here in Andalucia, but I am sure I can improvise…and I most definitely will be making this one very soon 🙂

      1. Chica, I do hope you improvise and make this. It’s one of the best tarts I’ve ever, ever made. And it never fails to bring guests to their knees in praise. (Well, not literally, but you get my drift.)

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