Caramelized onions and a spread of Dijon mustard make this rustic summer vegetable pie a favorite for an easy lunch, a light dinner or impressive appetizer.
Welcome, lazy dog days of summer. I’ve been waiting for you to show up.
The time of year I wish I was one of my favorite four-legged furry friends so that it would be perfectly acceptable to lie about the house and languish in the long shadows of the evening as the air conditioner kicks on and off before I wander down the hall to have someone else prepare my dinner, feed me and even get a little scratch on the old belly. And of course since I wouldn’t have thumbs, how could I possibly be expected to do the dishes?
It sounds pretty good. Except I wouldn’t want to eat dog food. No. Not at all. But rustic tarts loaded with summer veggies? That I will do. And friends, it is a FAR cry from dog food.
We’ve been making our way to the farmers market each weekend this season to pick up our weekly veggie and fruit fare. This time around I made it before all of the heirloom tomatoes had been snatched up.
Lucky me—for sure!—and lucky you too.
Because now I present this veggie laden galette.
A galette is simply a rustic pie with a fancier name and they’re terribly simple to make. If you can fold a napkin, you can make a galette.
This recipe is another in the monthly #eatseasonal round-up of recipes my friend Becky of The Vintage Mixer has inspired thanks to her Seasonal Produce Guide. I’m truly not sure if there is another recipe I could have imagined that would be more seasonal, right now, right here, than this one.
Local heirloom tomatoes mixed with a few baby ‘mates from my garden (finally! they’re ripening!) resting comfortably on fresh zucchini and caramelized onions then wrapped in a flaky crust. That’s store bought.
Because we have better things to do with our waning days of summer.
About the Recipe
Sure. I am a big fan of making my own pie crust, but let’s get real. Sometimes store-bought crust just really seals the deal. This recipe takes one box and creates two galettes. Perfect for a light dinner or cut it in slices for a totally seasonal appetizer.
This recipe could be a bit drab with just layers of veggies, so to give it some zing, I slathered a bit of Dijon mustard to the bottom of the galette before layering on the veggies. My advice? Do not skip this step, it really adds to the flavor.
Caramelized onions. What more can you say about their sweetness? The only thing I can add is that you have to take them low and slow. Be patient. It’s their virtue.
I topped this with feta and thyme. You however could use goat cheese and basil, or gorgonzola and tarragon. It’s totally adaptable. But I think this combo is pretty well perfect.
To get the zucchini cut in uniformed slices I used my OXO handheld mandoline. It’s one of my favorite kitchen tools, and you should make it one of yours too.
If you make this recipe, please let me know! Leave a comment below or take a photo and tag me on Instagram or Twitter with #foodiecrusheats.
Heirloom Tomato, Zucchini, Caramelized Onion and Feta Galette
- 2 yellow onions , peeled and sliced
- 1 tablespoon extra-virgin olive oil , plus more for drizzling
- 2 tablespoons butter
- 2 refrigerator pie crusts , 1 box
- 1 egg white , beaten
- 2 tablespoons Dijon mustard
- 2 heirloom tomatoes , sliced
- 2 zucchini , thinly sliced
- ½ cup feta cheese , crumbled
- Sprigs of fresh thyme leaves
- Kosher salt and freshly ground black pepper
- Preheat a large sauté pan over medium heat and melt the butter and olive oil together. Add the sliced onions, season with salt and pepper and reduce the heat to simmer and slowly cook the onions for about 40-45 minutes, stirring occasionally until the onions are soft and caramelized. Set aside to cool.
- Cut one of the refrigerator pie crusts into a roughly 7 X 9-inch square, so that you trim the rounded edges from the crust and discard or save for another use. Place the pie dough on one half of a large baking sheet lined with parchment paper. Lightly brush the bottom of the crust with the beaten egg white. Spread 1 tablespoon of the Dijon mustard on the crust, leaving a 1-inch border of plain pie crust all the way around the edge. Scatter half of the caramelized onions on the mustard then layer 2 rows of zucchini slices down the middle of the crust. Top with slices of tomato and sprinkle with thyme leaves and half of the feta cheese then drizzle with a little additional olive oil. Season with salt and pepper. Fold the long edges of the pie crust over and then the short edges over the zucchini slices. Repeat the process with the other crust.
- Preheat the oven to 400 degrees F. Bake the galettes for 15 minutes or until the crust is golden and the vegetables are softened.
- Slice and serve warm or at room temperature.
As we have for the past few months, Becky has amassed a group of us who are posting #eatseasonal recipes today. Some are some are sweet, some are savory and they’re all in season now. They’re all good and they’re all seasonal and are listed below. Follow the #eatseasonal hashtag on Instagram, Twitter and Facebook to discover more seasonal eats.
Healthy Whole Grain Zucchini Bread Pancakes by Bless This Mess
Raspberry Swirl Frozen Yogurt Pie by Cookin’ Canuck
Savory Summer Squash Custard by Vintage Mixer
Zucchini and Yellow Squash Noodles with Turkey Sausage Bolognese by Flavor the Moments
Potato and Egg Breakfast Boats by From Gate to Plate
Zucchini and Green Bean Sauté by The Lemon Bowl
Triple Berry Scones by Simple Bites
Grilled Summer Squash with Sun-Dried Tomatoes and Basil Ghee by Project Domestication
Zucchini, Corn and Pesto Flatbreads by Kitchen Confidante
Blackberry Buckle by Mountain Mama Cooks
Raspberry and Brown Sugar Bourbon Fizz by Floating Kitchen
Happy cooking friends!
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This was delicious! I used shaved parm for the cheese, since husband doesn’t like feta, and used slivered fresh basil instead of thyme. (Because I had it on hand) I also used a sheet of puff pastry (store bought), rather than pie crust, because I had it on hand. I will definitely make this again.
My family loved this even though I burnt the crust because I lost track of time when it was on the grill. I did sweat the zukes and tomatoes for about 10 min beforehand and strained the excess liquid. I didn’t have feta so I used parm cheese instead.
It was delish! Highly recommend baking it on the grill (on a baking sheet) to avoid heating up the house during the summer.
Thank you for this recipe! Will definitely be making it again and again. :)
Is there anything I could use instead of egg whites? My daughter is allergic. Thanks!!
Yes Rachel, you could use cream or half and half and brush it on instead.
thanks so much!!
This is as delicious as it looks. We did double+ the onions, probably because my onions were small, added sweet summer corn, and tried subbing in chevre- it was good too!
I made this yummy recipe using carmalized onions previously made in my slow cooker and heirloom tomatoes from my garden. Thank you for something different to enjoy!
How YUM is this?!? I added bell pepper to my recipe, only change, its wonderfully simple, healthy and flavorful!
I made this on Sat night for a dinner party. I carmalized the onions in the morning and refrigerated them. I also presliced the zucchini & tomatoes. It came together quickly and was fabulous!!! I ate the leftovers for breakfast
I was wondering though, could I use a carmalized onion jam in a pinch if I don’t have 40 min to do the onions? Going to the beach and would want to take less time.
This was beautiful, delicious and incredibly well received! It is definitely staying in the top of my entertaining collection! (I did substitute the feta/thyme for the basil/goat cheese – delightful!)
I didn’t find refrigerator pie crusts in the store that weren’t already in a pie pan, so I went with the pie approach instead. It was delicious! The flavors really pair well together. Thanks for the recipe!
wow, don’t know how I missed this until it was just featured in the zucchini recipe recap, really love galletes, not too much bread but enough and are able to show you what’s inside, love all of these vegetables also thank you for the Dijon tip!
The Dijon adds a nice flavor
Tasted delicious but the dough was very soggy even after baking longer than recommended. The egg white on the bottom didn’t seem to help. What did I do wrong and how do I fix.
Sprinkle tapioca powder/flour on the crust first.
I made this exactly how your recipe calls and it was absolutely delicious! I wouldn’t change a thing, everybody raved about it :)
Can you make these ahead of time? Like make in the morning and bake about 6 hrs later? I am planning a party and would love to make these (I’ll be trying it out this weekend too).
This tart is good, but there’s a lot of liquid that gets released during cooking, especially from the tomatoes. The egg whites kept the bottom nice and crisp, but I didn’t feel like the top of the crust baked all the way, even though I left it in an extra five minutes. If I make it again (and I would like to!), I will parbake the crust for a few minutes before assembly, and will slice and seed the tomatoes, salt them, and let them sit for ten or fifteen minutes, and then get as much moisture as I can off of them using paper towels. There’s plenty of time to do all of that while you wait for the onions to caramelize.
Otherwise, the galette is lovely, full of vegetables, tasty, and awesome for leftovers. I reheated mine in the oven and also in a covered cast-iron skillet on low heat. The cast-iron method worked much better because it kept the bottom of the crust crisp.
My husband and I loved these. My 5 yr old did not want the Dijon mustard which made the crust dry, which then made her not like the crust. I used leeks instead of the onions because that’s what I had. I also only used heirloom mini tomatoes, which allowed you to get a bit of sweet tomato with every bite. Definitely going into my “make again” pile.
This tasted excellent, was healthy, beautiful and perfectly in season!! Loved it!!
So happy someone actually made it instead of only posting comments on how beautiful the pictures are
Heidi, everything I LOVE and adore is in this gorgeous galette. Oh my goodness, it’s perfect.
I’m going to try to pass this off as pizza to my kids. This looks like a much healthier alternative.
Leah / Freutcake
Gorgeous and I bet it tastes delicious too! Pinning this for later. xo
Okay, this is seriously the most beautiful tomato galette that I’ve ever EVER seen!! Gorgeous and I’m sure delicious too. I wish we went to the same farmers market because I’m there every weekend too! It’s the best time of year :)
Ok, this is seriously beautiful! My mouth is watering, I need this in my life now!
Lauren at Keep It Sweet
This looks just beautiful and so delicious!
Aimee @ Simple Bites
This is so utterly gorgeous! I’m about to harvest a ton of tomatoes. Can’t wait to try this!
I have a question, if you don’t precook the tomatoes and zuchhini, do they release a lot of moisture during cooking to make soggy?
Hi! I wondered the same thing the first time I made it but with the swath of egg whites on the bottom of the crust and layering the Dijon, then onions, then the zuch and finally the tomatoes, I didn’t have any problems with them getting soggy and I’ve made them 3 times. I think the layering helps a lot and the zuch and the tomatoes simply roast on top. Enjoy!
Fernando @ Eating With Your Hands
Couldn’t agree more regarding the everlasting battle between store bought vs. home made crust. Sometimes the store bought works just as fine (especially on hot summer days)
Sarah | Broma Bakery
These tomatoes are stunning. Like, they are the Heidi Klum’s of the tomato world.
Amy @ Thoroughly Nourished Life
This galette just sings of summer! And those beautiful heirloom tomatoes are making me long for warmer weather and hot sunshine filled tomatoes :) I can’t wait!
Laura (Tutti Dolci)
So gorgeous, I want this galette for dinner tonight!
Liz @ The Lemon Bowl
You had me at “mustard for zing” <– YES!!! Also, thank you for purchasing the pie crust.
Emily @ Zen & Spice
Absolutely beautiful!! Love the colors. Summer is so great for fresh veggies!
Amy @ Parsley In My Teeth
Wow, this is incredibly beautiful! What a great way to showcase all of those amazing tomatoes.
Mike | Chili Pepper Madness
Looks delish! I love a good galette, the good old “rustic tart”. They’re so fun to make, especially when you have such great ingredients on hand. Add in a few roasted chili peppers for me, though! Nice and spicy. Great job. I see a galette in my very near future.
These look amazing and fresh!
xoxoBella | http://xoxobella.com
Lauren Gaskill | Making Life Sweet
Heirloom tomatoes are always my most precious farmers market purchase. I can’t wait to put my next ones to use in this galette! SUPER delicious!
Liz @ Floating Kitchen
There is a whole lotta summer up in that galette. And I’m loving every little bit of it!
This galette looks incredible and really showcases those gorgeous veggies!
Katie @ Garnish Blog
This looks amazing. What a great way to make use of summer veggies! I’ll be trying it soon.
Abby @ The Frosted Vegan
That galette is beauuuutiful! I love fresh tomatoes, so this time of year is my favorite. Enjoy the rest of your summer dear! xo