Upside-Down Onion Tart: the Recipe for a Delicious and Quick Appetizer!

Upside-Down Onion Tarts are a delicious and appetizing appetizer, also ideal as an aperitif or for a buffet. In our recipe we flavored the onion puff pastries with balsamic vinegar, to make them even more delicious. For the preparation you can use white onion or red onion, in any case it is important to use excellent quality onions, given the simplicity of the recipe. They cook in the oven for less than half an hour, ready to serve.

Upside-Down Tarts' Origins

Upside-down tarts, savory and sweet alike, trace their origins back to the French dish known as "tarte Tatin," which was first created by accident at the Hôtel Tatin in Lamotte-Beuvron, France, in the late 19th century. Initially a mistake made while attempting to prepare a traditional apple pie, the result was so delightful that it became a cherished recipe. The concept of cooking the ingredients in a pan with butter and sugar (or savory seasonings for meat or vegetable versions), then topping them with pastry and flipping the whole arrangement after baking, was revolutionary. This technique has since been adapted worldwide, not only for the classic apple but also for an array of ingredients, including tomatoes, onions, and other vegetables for savory tarts. Sweet versions often include fruits like pears, peaches, or plums, making these tarts a versatile and beloved dish in many cultures.

Tips and Variations

– Introduce other vegetables such as thinly sliced tomatoes, zucchini, or bell peppers beneath the onion layer to add color and variety. Adding garlic or a sprinkle of thyme or rosemary can also enhance the savory notes.

– Before placing the puff pastry over the onions, sprinkle a layer of grated cheese like Parmesan, Gruyère, or mozzarella for a gooey, rich texture and a boost of flavor.

– For a deeper flavor, consider caramelizing the onions in a skillet with the olive oil and balsamic vinegar before layering them on the baking sheet. This will bring out a sweet, complex flavor in the onions.

– Experiment with different types of vinegar like red wine vinegar, sherry vinegar, or a flavored balsamic vinegar to subtly alter the tart's flavor profile.

– For a heartier dish, include layers of cooked bacon, ham, or anchovies underneath the puff pastry.

– Once baked, let the tart cool for a few minutes, then carefully invert it onto a serving plate. Serve warm with a side of mixed greens or a light salad to complement the rich flavors of the tart.

– Depending on the thickness of your added ingredients or the desired crispness of the puff pastry, you might need to adjust the baking time. Keep an eye on it after the 20-minute mark to ensure it doesn't overcook.

How to Store Upside-Down Onion Tarts

You can store the onion puff pastries for 1 day tightly closed in an airtight container. Before enjoying them, reheat them for a few minutes in the oven.

Find out how to prepare Upside-Down Onion Tarts by following our step-by-step recipe and advice.

How to Prepare Upside-Down Onion Tarts

Pour a little olive oil onto a baking sheet, and spread it into six different squares a little helping yourself with a kitchen brush.

Add a drizzle of balsamic vinegar to each oil square.

Sprinkle oregano on each vinegar and oil square.

Then grate some salt and pepper as well.

Place a slice of onion on top of each square.

Then, sprinkle both salt & pepper and oregano again on each slice of onion.

Add a puff pastry rectangle on top, and close the edges with your fingers. Then, brush each puff pastry rectangle with olive oil.

Bake for 25 minutes at 356°F (180°C).

Serve while still warm and enjoy!