Savory Tomato and Caramelized Onion Galette on Pie Crust

tomato Caramelized Onion Galette

Tomato and caramelized onion galette is a delicious dish made from sweet onions and juicy, meaty tomatoes and wrapped in flaky pie crust. It may sound fancy, but it is so basic that everyone can make it, even to feed a crowd. Just brush it with egg wash and sprinkle the edges with sesame seeds to turn this rustic dish into a more appealing onion galette.

Tomato and Caramelized Onion Galette


  • 1 store-bought pie crust (buy here)
  • 2 medium-sized fresh heirloom tomatoes, sliced
  • 1 yellow onion, thinly sliced
  • 2 tablespoons of unsalted butter
  • Salt to taste
  • 1 teaspoon of red wine vinegar (buy here)
  • 1 teaspoon of brown sugar (buy here)
  • 2 leaves of fresh basil
  • 1 egg, beaten
  • Sesame seeds, to garnish


  • Oven
  • Medium bowl
  • Paper towel
  • Rolling pin (optional)

How to make French onion galette

  1. Preheat the oven to 400°F
  2. Toss the tomato slices and salt in a bowl and soak them for 15 minutes
  3. Remove the tomato slices from the bowl, pat them dry with paper towels, and set aside
  4. Heat the butter in a skillet over medium heat, add onion slices, and season to taste with salt
  5. Use medium-low heat and stir occasionally. As it goes, you will hear a gentle sizzle
  6. Add the brown sugar and red wine vinegar and cook until the onions are caramelized. The cooking process may take 30 to 35 minutes in total
  7. Roll your pastry out. You can use your fingers seal any cracks or use a rolling pin to smooth out the dough
  8. On a parchment-lined baking sheet, lay out the crust and spread it with the onions, about 2-3 inches from the edge. Make sure there is one tablespoon left to top your tomato and caramelized onion galette later
  9. Arrange the tomato slices over the onion layer and fold the edges up around the filling
  10. Brush the crust with the beaten egg. This will help your crust get a golden brown color after baking
  11. Sprinkle the crust edges with sesame seeds and bake for 25 to 35 minutes
  12. Remove from the oven and top it with the reserved onions and fresh basil, and serve

If you need some ingredients and equipment for the tomato galette recipe, make sure you check out the following lists of product descriptions

Recommended Products

1. Marie Callender’s Pie Crust

Marie Callender’s Frozen Pastry Pie Shells, 16 Ounce
  • Save time and create your own delicious pies at home with these ready-made pie shells.
  • Made from scratch, these pastry shells are a great foundation to any apple pie, pecan pie, lemon meringue, and more.
  • Reuse the baker’s pie pan for additional baked desserts.

It has two deep-dish pastry shells and a reusable baker’s pie pan. These ready-made pie shells contain no artificial colors, preservatives, or flavors. Besides your tomato galette, it is also perfect for any apple pie, pecan pie, lemon meringue, and more.

You can make up to 16 servings out of the box, and each serving contains 130 calories and 0 grams of trans fat. To use it, you should keep it frozen instead of thawing it

2. Pompeian Organic Red Wine Vinegar

Pompeian Gourmet Red Wine Vinegar, Perfect for Salad…
  • America’s bestselling red wine vinegar
  • Pairs perfectly with Pompeian’s farmer-crafted olive oils
  • Best used for salad dressings, assorted marinades and sauces
  • A quintessential flavor of Mediterranean cuisine

It is a type of unfiltered, raw, and unpasteurized red wine vinegar that is only made with water. It is packed in a 16-ounce bottle with non-allergenic ingredients. It is perfect for salad dressings, assorted marinades, and sauces with a bold, fruity taste and a bright, fresh flavor. You can also pair it with hearty foods like pork, beef, and vegetables.

3. Domino Pure Cane Sugar

Adding this to your tomato and caramelized onion galette will never be a mess anymore with its flip-top canister. The crystals have a light brown color and contain 10 calories per teaspoon. It tastes like vanilla and does not clump or harden easily. Besides caramelizing your food, it is also perfect for baked treats, ice creams, flavored drinks, or fruits.

4. MMmat Silicone Baking Mats

MMmat Silicone Baking Sheet – Non Slip German Silicone Mats…
Premium German WACKER silicone ensures MMmat’s quality. Food-grade, BPA-free, and non-toxic. Non-stick surface, 0.75mm thickness, easy cleaning. Heat resistant up to 500°F. Sized 11.6×16.5 inches, perfect for various baking needs.

It comes in two pieces, either of which is etched with a number of rounds to fit your cookie or macaron piping bag. This is an alternative to your disposable parchment paper and comes in 11.6×16.5 inches. With non-stick and non-toxic materials, it will not absorb odors or flavors and make your cleanup easier.

It is resistant to temperatures ranging from -40°F up to 500°F temperature and safe for the oven, dishwasher, microwave, and freezer. You can use it for pizza, salad, dessert, or even to roll out your dough.

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