Tarte tatin is a French classic that looks impressive and is really just a simple upside down tart. The traditional version piles caramelized apples onto buttery puff pastry.
This savory Onion Tarte Tatin swaps the apples for onions, and shallots are the favorite pick because they turn tender, sweet, and beautifully caramelized in the oven. A balsamic caramel brings deep, pronounced flavor that pairs so well with crisp pastry.
Serve it warm with crumbled goat cheese as a side dish or an appetizer. It works for any occasion, and it is especially welcome on a holiday table when you want something a little different from the usual spread.
Here is the quick overview before we start cooking:
Good quality puff pastry makes a big difference here, so it is worth choosing carefully. A favorite brand is made with real butter and also offers a vegan option. You need 14 ounces, defrosted in the refrigerator.
For the onions, plan on 12 to 15 shallots, or another onion of choice. Any onion can be used, including leeks, red onion, and yellow onion, but shallots are preferred and they look especially nice once arranged in the pan.
Sugar is essential for the caramel and the recipe does not suggest an alternative. Caster sugar, also called superfine sugar, is even better if you have it on hand.
Use a good quality aged balsamic vinegar, because its flavor really shines through in the finished tart. Fresh thyme can be used in place of the rosemary. Salt and pepper add flavor to the caramel, and crumbled goat cheese is an optional topping.
14 ounces puff pastry, defrosted in the refrigerator
12 to 15 shallots, or another onion of choice
1/2 cup granulated sugar
1/4 cup water
3 tablespoons balsamic vinegar
4 tablespoons butter
2 teaspoons fresh rosemary, finely chopped
3/4 teaspoon kosher salt
1/4 teaspoon black pepper
Crumbled goat cheese, for topping, optional
A quick note on swaps: shallots give the sweetest, most delicate result, and even thickness matters more than which onion you choose. Slice everything to the same thickness so the rounds cook evenly.
How to Make this Onion Tarte Tatin Recipe
The whole process is friendly once you know the order: par cook the shallots, build the caramel, assemble, bake, rest, and flip. Read through the steps once before you begin, and everything will feel calm and simple.
Preheat the oven. Set it to 400°F.
Par cook the shallots. Bring a medium pot of water to a boil, then remove it from the heat. Add the shallots whole and unpeeled, cover the pot, and let them sit for 6 to 7 minutes. This step makes them significantly easier to peel and helps soften them so they become caramelized and melty in the oven.
Peel and slice. Drain the shallots. Once they are cool enough to handle, slice off both ends, then remove the peel, which should come off easily. Slice each shallot into 1/2 inch thick rounds and set aside.
Roll the puff pastry. Roll it out on a lightly floured surface until it is large enough to cut an 11 inch round. Return it to the refrigerator while you make the caramel so it stays cold and firm.
Start the caramel. Heat a 10 inch stainless steel skillet over medium heat and add the sugar and water. Gently stir just until the sugar dissolves, then let it boil untouched for 4 to 5 minutes until it turns golden brown.
Finish the caramel. Carefully add the butter, balsamic vinegar, rosemary, salt, and pepper. The mixture will bubble up a little, which is normal. Whisk well and let it simmer for 30 to 60 seconds, then remove the skillet from the heat.
Assemble the tart. Arrange the shallots over the balsamic caramel, placing them as close together as possible. Place the puff pastry over the top and gently tuck in the edges.
Bake. Bake for 30 minutes until the pastry is golden brown. Cover it with aluminum foil and return it to the oven for another 30 to 35 minutes.
Rest and check the caramel. Remove the skillet from the oven and let it sit for 5 to 10 minutes. Carefully tilt the pan and look at the caramel. If it looks watery, turn a burner to medium high and simmer it for 2 to 3 minutes until it thickens again. This can happen depending on how much moisture the shallots contain.
Cool, flip, and serve. Let the tart cool for 15 to 20 minutes, and at least 15 minutes, so the caramel can set. Carefully flip it onto a large plate or cutting board, top with crumbled goat cheese, and slice. Enjoy!
Timing matters more than it looks. Resting gives the caramel a chance to firm up, and that is what keeps the pastry crisp instead of soggy once you flip the tart.
Wondering why a tarte tatin sometimes ends up with a soft base? It is usually excess moisture from the onions soaking into the pastry after flipping. Follow the resting, tilting, and thickening steps carefully, and you will land on a crisp, buttery crust every time.
Equipment
You need one heavy duty, oven safe skillet for this recipe, because the tart starts on the stovetop and finishes in the oven. Stainless steel is the favorite choice, and cast iron or enameled cast iron also work well.
If you use stainless steel, double check that the handle is ovenproof before it goes anywhere near the oven. A 10 inch skillet is the perfect size for 12 to 15 shallots and an 11 inch round of pastry. If your skillet is larger, you will likely need more shallots to fill the pan.
Heavy duty, oven safe skillet
10 inch size preferred
Stainless steel, cast iron, or enameled cast iron
Ovenproof handle
Storage
Let the tarte tatin cool completely, then cover it and refrigerate for up to 3 days.
Reheating
Reheat the whole tart at 350°F for 15 to 20 minutes, until it is warmed through and the puff pastry is crisp again. Individual slices can go into the oven for 10 to 15 minutes. Microwaving is not suggested, because the puff pastry will get soggy and lose that lovely flaky texture.
Top tip
Let the tart cool for at least 15 minutes before you flip it. If you flip too soon, the caramel will not have set, and that loose caramel will soak into the pastry and make it soggy. Wait the full 15 to 20 minutes, then flip slowly and confidently and watch the tart slide onto the plate in one piece.
More tips
Par cooking the shallots for a few minutes does more than make them easier to peel. It also softens them slightly so they become caramelized and melty in the oven. Slice the onions to an even thickness so every piece cooks at the same rate.
When you make the caramel, do not stir it once the sugar has dissolved. Stirring encourages crystallization. If the caramel browns unevenly and the middle is getting dark too quickly, gently swirl the pan instead.
After you add the butter and balsamic, the caramel may seize slightly. That is normal. Keep it over medium heat and keep whisking until it comes back together into a smooth sauce.
Color is your best guide. The caramel should finish at a medium amber. If it smells burnt, it has probably gone too far, and starting over is the safer choice.
One last reminder: cool, tilt, thicken if needed, then flip. Those few patient minutes are what give you crisp pastry instead of a soggy base.
FAQs
What is onion tarte tatin?
Onion tarte tatin is a savory twist on the classic French apple tarte tatin, made with balsamic caramelized shallots baked under buttery puff pastry and flipped upside down. It is a vegetarian French dish that works beautifully as a side dish or appetizer, especially for holidays. This recipe makes 8 servings and takes about 1 hour 30 minutes total.
What is the best onion for onion tarte tatin?
Shallots are the preferred choice because they are milder, sweeter, and hold their shape nicely when sliced into rounds. You can also use yellow onion, red onion, or leeks; sweet varieties like Vidalia give especially tender results. The recipe calls for 12 to 15 shallots sliced into 1/2-inch rounds.
Why is my onion tarte tatin soggy?
A soggy onion tarte tatin is usually caused by excess moisture from the shallots soaking into the pastry, especially if it is flipped too soon. Let the tart cool for 15 to 20 minutes before flipping, and tilt the pan to check the caramel. If it looks watery, simmer it for 2 to 3 minutes on medium-high until it thickens.
Can onion tarte tatin be made ahead?
Yes, onion tarte tatin can be made ahead. Let it cool completely, cover it, and refrigerate for up to 3 days. To reheat, warm the whole tart at 350°F for 15 to 20 minutes until the pastry is crisp again, or reheat individual slices for 10 to 15 minutes. Avoid microwaving because it makes the pastry soggy.
Onion Tarte Tatin Tarte tatin is a French classic that looks impressive and is really just a simple upside down tart. The traditional version piles caramelized apples onto buttery puff pastry.
Total Time:90 min
Yield:8 servings 1x
Ingredients
Scale
14 ounces puff pastry, defrosted in the refrigerator 12–15 shallots, or another onion of choice 1/2 cup granulated sugar 1/4 cup water 3 tablespoons balsamic vinegar 4 tablespoons butter 2 teaspoons fresh rosemary, finely chopped 3/4 teaspoon kosher salt 1/4 teaspoon black pepper crumbled goat cheese, for topping
Instructions
1-Preheat oven to 400°F: Preheat oven to 400°F. 2-Bring a medium pot of water to: Bring a medium pot of water to a boil, then remove from heat. Add the shallots to the pot (whole and unpeeled), cover, and let sit for 6-7 minutes. 3-Drain the shallots: Drain the shallots. When they are cool enough to handle, slice off both ends, then remove the peel (it should come off easily!). Slice each shallot into 1/2-inch thick rounds. Set aside. 4-Roll out the puff pastry on a: Roll out the puff pastry on a lightly floured surface until it’s large enough that you can cut out an 11-inch round. Return to the refrigerator while you make the caramel. 5-Heat a 10-inch stainless steel skillet over: Heat a 10-inch stainless steel skillet over medium and add in the sugar and water. Gently stir just until the sugar is dissolved, then let it boil untouched for 4-5 minutes, until it’s golden brown. 6-Carefully add in the butter, balsamic, rosemary,: Carefully add in the butter, balsamic, rosemary, salt and pepper (the mixture will bubble up a little bit) and whisk well. Let it simmer for 30-60 seconds while whisking. Remove from heat. 7-Arrange the shallots atop the balsamic caramel,: Arrange the shallots atop the balsamic caramel, placing them as close together as possible. Place the puff pastry over the top and gently tuck in the edges. 8-Bake for 30 minutes until the puff: Bake for 30 minutes until the puff pastry is golden brown, then cover the puff pastry with aluminum foil and return to the oven for another 30-35 minutes. Remove from the oven and let sit for 5-10 minutes. Carefully tilt the pan and check to see if it looks like the caramel is watery. If so, turn on a burner to medium-high and let it simmer for 2-3 minutes until it starts to thicken again. (This can happen depending on how much moisture your shallots have.) Let it cool for 15-20 minutes, then carefully flip onto a large plate or cutting board. Top with crumbled goat cheese before slicing. Enjoy!
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