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    Home > Appetizers and Beverages > Savory Balsamic Caramelized Onion Tart with Gruyere Cheese And Bacon

    Savory Balsamic Caramelized Onion Tart with Gruyere Cheese And Bacon

    Published: Jul 30, 2018 · Modified: Nov 17, 2022 by Lea Ann Brown · This post may contain affiliate links

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    Caramelized onion tart with bacon and thyme

    This is a recipe for Caramelized Onion Tart with Gruyere Cheese. This combination of sweet and savory filling is heavenly. Balsamic vinegar, bacon and thyme make this an awesome savory tart to serve as an appetizer, or a light dinner with a simple tossed salad.

    Onion tart with caramelized onions and Guyere cheese.

    It’s late July in Colorado and that means I’m more excited to cook than any other time of year. Our Colorado fresh produce is starting to come in, fresh sweet corn, Rocky Ford Melons and Musso Farms is heralding the news that it’s Pueblo Chile Season.

    I still have most of a bucket of Vidalia Onions in dark storage (back corner of my pantry) that I need to use before they go bad. And after all there are new Colorado onions to take their place now. I can’t think of a better way to use them than in this onion tart.

    Caramelized Onion Tart with bacon and gruyere sliced and served on a wood cutting board.

    This onion tart recipe comes from the Pastry Kitchen at Cook Street Culinary School.

    I love everything about this tart. The Vidalia onions become even more sweet with a long stove top sautee. And even more delicious cooking them with bacon and even more interesting with the addition of balsamic vinegar. Who can resist that combo of ingredients? Not us.

    caramelized onion tart with bacon, thyme and gruyere cheese.

    The seasoning for this onion is simple with fresh thyme. I used Lemon Thyme from my garden, but of course any fresh thyme will add a delicious note.

    How to Blind Bake A Tart Shell:

    I hope you’ll consider taking the time to make a homemade pie shell for this tart recipe. One of the great take-aways from Culinary School was how to make an All Butter Pie Crust. It’s really very easy and a skill I feel every home cook should learn. As French technique you’ll also see it referred to as pate brisee.

    When making pies or tarts that call for a delicate filling a filling that’s already been cooked, you’ll need to blind bake the shell first, which simply means one pre-cooks the dough before adding the filling. That’s because the hour or so cooking time that it takes to bake the crust would over-cook some fillings, such as this onion tart filling.

    • Simply place the dough into the pie or tart pan and gently form the dough to the shape of the pan. Then cover the dough with a round of parchment paper that’s been cut to size and place pie weights or dried beans in the parchment paper to hold the paper against the dough.
    • Chill the crust for thirty minutes. I’ve even placed it in the freezer to make sure it gets nice and cold.
    • Bake the pie dough in an oven preheated to 375 degrees for twenty minutes.
    • Remove the pie from the oven, and lift out the paper and weights. Prick the bottom of the crust all over with a fork, to prevent bubbles. This is called docking.
    • Return the crust to the oven and bake for an additional 15 to 20 minutes, until the crust is golden all over.

    Now we’re ready to make this onion tart.

    Caramelized onion tart with gruyere cheese, bacon and thyme

    Recipe for Caramelized Onion Tart with Gruyere, Bacon and Thyme:

    I’ve used a 9-inch tart pan for my recipe. You can also use an 8-inch pan for a thicker tart. Or even 8 individual 4″ to 5″ small tart pans.

    I hope you give this Caramelized Onion Tart recipe a try. And if you do, please come back and let me know how you liked it and give the recipe a star rating.

    Your feedback is valuable to me for developing future recipes. And if you have a favorite onion tart recipe, let me know, I’d love to give it a try.

    Once I made my first tart, I became quite obsessed with making more and more. If you’re looking for more tart recipes, you won’t want to miss:

    • Creme Fraiche Pear Cranberry Tart
    • Fresh Tomato Tart Recipe with Gruyere Cheese
    • Lemon Tart Recipe with Sour Cream Lemon Curd
    • French Pear Tart Bourdaloue with Apricot Rum Glaze

    And if you’re looking for more tart or dessert recipes, don’t miss my dessert category. You’ll find both savory and sweet treats, including the most popular on my site for Caramelized Banana Ice Cream.

    And, don’t forget to subscribe to my newsletter for more delicious recipes and cooking tips. Make it a delicious day … every day.

    If you’ve tried this or any other recipe on my website, please leave a star rating in the recipe card below. And write a review in the comment section. I always appreciate your feedback.

    Caramelized Onion Tart with bacon and gruyere sliced and served on a wood cutting board.

    Caramelized Onion Tart with Gruyere

    Caramelized Onion Tart with Bacon and Gruyere Cheese and. Simply seasoned with fresh thyme and balsamic vinegar, This creamy cheese tart is a winner.
    4.74 from 15 votes
    Print Pin Rate
    Course: Appetizer Recipes
    Cuisine: French
    Prep Time: 15 minutes
    Cook Time: 20 minutes
    Total Time: 35 minutes
    Servings: 8
    Calories: 266kcal
    Author: Lea Ann Brown

    Ingredients

    • 1 Pie Crust preferably homemade – blind baked
    • 3 large onions emincee’d (thin sliced)
    • 3 ounces bacon fine diced (about 3 – 4 slices)
    • 1 tablespoon sugar
    • 1/2 teaspoon salt
    • 2 teaspoons balsamic vinegar
    • 2 tablespoons fresh thyme chopped
    • fresh ground black pepper
    • 1/4 cup heavy cream
    • 1 cup gruyere grated
    Prevent your screen from going dark

    Instructions

    • Cook the bacon, stirring often, in a large non-stick fry pan over medium heat until mostly crisp. Remove onions to a plate and discard all but about 1 tablespoon of the grease.
    • Reduce heat medium low. Add the onions, sugar and salt and cook, stirring often until they cook down by two thirds.  About 10 minutes.
    • Add the 2 teaspoons vinegar, reduce heat to low, and continue to cook until the onions are an even golden brown and softened, 15 – 20 minutes. (depending on the onions)
    • Stir often and scrape up any brown bits clinging to the bottom of the pan. Watch the onions closely, you don't want them to burn, just to become golden and caramelized.
    • Remove from heat, stir in the thyme and cooked bacon. Allow the ingredients to cool slightly. Taste, season with black pepper and add more salt if necessary.
    • Preheat oven to 350 degrees. Stir the cream into the caramelized onions until thoroughly combined. 
    • Place the filling in a 9″ tart shell that’s been blind baked and spread it evenly with the back of a spoon. Sprinkle grated gruyere on top. Bake in oven until the filling is set, about 15 minutes. 
    • Serve warm or at room temperature. Garnish with a sprig of thyme.

    Video

    Notes

    You can use a 9″ tart pan, an 8″ tart pan for a thicker tart. Or even 4 – 5 inch individual tart pans.
    How To Blind Bake A Pie Or Tart Shell
    Simply place the dough into the pie or tart pan and gently form the dough to the shape of the pan. Then cover the dough with a round of parchment paper that’s been cut to size and place pie weights or dried beans in the parchment paper to hold the paper against the dough. Chill the crust for thirty minutes. I’ve even placed it in the freezer to make sure it gets nice and cold.
    Bake the pie dough in an oven preheated to 375 degrees for twenty minutes.
    Remove the pie from the oven, and lift out the paper and weights. Prick the bottom of the crust all over with a fork, to prevent bubbles. This is called docking. Return the crust to the oven and bake for an additional 15 to 20 minutes, until the crust is golden all over.
     

    Nutrition

    Calories: 266kcal | Carbohydrates: 18g | Protein: 8g | Fat: 18g | Saturated Fat: 8g | Cholesterol: 35mg | Sodium: 364mg | Potassium: 153mg | Fiber: 2g | Sugar: 4g | Vitamin A: 349IU | Vitamin C: 7mg | Calcium: 196mg | Iron: 1mg
    Tried this Recipe? Pin it for Later!Mention @lannisam or tag #CookingOnTheRanch!

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    Reader Interactions

    Comments

    1. Lisa says

      July 30, 2022 at 2:07 pm

      I am going to make this. About how many slices of bacon will yield the 3 ounces

      Reply
      • Lea Ann Brown says

        August 03, 2022 at 6:22 am

        Thanks for your note Lisa. About 3 – 4 slices. I do recommend using a kitchen scale to weigh. I don’t know how I live without mine. Let me know if you have any other questions.

        Reply
    2. Sue W says

      May 02, 2022 at 8:19 pm

      5 stars
      This recipe was SO delightfully delicious! I have made it twice now, and both times got rave reviews! The second time, I added garlic and it was amazing! Will definitely make again and again! LOVE this recipe!

      Reply
    3. Donna Acquaviva says

      February 09, 2022 at 9:37 pm

      5 stars
      Made this for a ladies luncheon. Absolutely the hit of the day! Easy to make, simple ingredients and a bang up result. Looked like a million bucks and tasted as such as well. Thanks for sharing.

      Reply
      • Lea Ann Brown says

        February 11, 2022 at 5:49 am

        Hi Donna

        I am so glad you made and liked the tart. And that it was a ht at the ladies luncheon. How fun!

        I appreciate that you took the time to send a note.

        Make it a delicious day.

        Reply
    4. Morgan says

      January 23, 2021 at 1:25 pm

      4 stars
      Made this year this weekend for a friend’s birthday. I also used the dough recipe. It was a great hit!

      Reply
      • Lea Ann Brown says

        January 27, 2021 at 11:02 am

        Hi Morgan! Fabulous. Thanks for letting me know.

        Reply
      • Lea Ann Brown says

        January 28, 2021 at 5:28 am

        Hi Morgan, I’m thrilled that you liked the recipe. Thanks for taking the time to comment.

        Reply
    5. Kira Reed says

      January 14, 2021 at 10:24 pm

      5 stars
      I made this Wednesday and it was perfect. I found this recipe while looking for recipes I could use with a store bought pie crust. I will try your recipe in the future along with the mini tarts using crescent rolls.
      We loved this tart and followed the recipe as written. Thank you!!

      Reply
      • Lea Ann Brown says

        January 15, 2021 at 6:07 am

        Good Morning Kira and Happy Friday.

        Thank you so much for your lovely note. I’m so glad you liked the recipe and thank you for taking the time to give it a review.

        It’s been awhile since I’ve made this recipe, you’ve inspired me to make it for a weekend treat.

        Reply
    6. Chelsea says

      December 21, 2020 at 7:52 pm

      Looks delicious! Any thoughts on whether this would freeze well?

      Reply
    7. Vanessa says

      August 20, 2020 at 1:03 pm

      Thanks for sharing! Does it keep long?

      Reply
    8. Suzanne says

      August 20, 2020 at 1:02 pm

      This look so good! What a flavorful and filling appetizer to make!

      Reply
      • Lea Ann Brown says

        August 25, 2020 at 6:19 am

        Hi Suzanne and thanks so much for your note. Always love hearing from my readers.

        I love making this for our neighborhood wine tasting parties. I’m always asked for the recipe.

        Reply
    9. Tammy says

      April 17, 2020 at 2:50 pm

      5 stars
      I loved this tart the only thing I added was about 1 tablespoon of butter to the onions so they would carmalize a little more and reduced the thyme to 1 tbsp as my husband is not a big fan of it. It was perfect I would make it again with the added butter and only 1 tbsp of fresh thyme. Thx

      Reply
    10. Kristy says

      October 13, 2019 at 1:51 pm

      4 stars
      I .made these as small bites using pillsbury crescent dough in a mini cupcake pan. They turned out good, but the thyme is overpowering and I used less than 1 tablespoon, the recipe calls for 2 so I’m glad I did less. Next time I’ll probably do even less. Thanks for the recipe!

      Reply
      • Lea Ann Brown says

        October 14, 2019 at 4:40 pm

        Hi Kristy. I adore that you made these as a mini version. So creative. I have one question to ask – did you use dried thyme or fresh?

        Reply
    11. John / Kitchen Riffs says

      August 01, 2018 at 8:14 am

      I just saw Colorado corn in our grocery store, and was so exited — love the stuff! Way better than the local corn, at least most of it. Anyway, wonderful looking dish. Great appetizer. Heck, I’d eat it as the main course! 🙂

      Reply
    12. Larry says

      July 31, 2018 at 7:10 am

      I love onions, I love caramelized onions, I love a good pie crust, I love Gruyere cheese so I’m pretty sure I’d really enjoy this although I’d probably use a stronger onion for more onion flavor and a little less sweet

      Reply

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    I'm Lea Ann, A Culinary School Grad bringing you Wild West Colorado inspired recipes. You'll find lots of Southwestern, and Mexican food recipes, and some favorites from Culinary School along with pro cooking tips. If you're an adventurous home cook looking to spice up your meal plans, you'll find plenty of inspiration and reliable, approachable, easy to follow recipes.

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