Caramelized Onion Tart with Gorgonzola and Brie Recipe

If you are craving a dish that beautifully balances sweet, savory, and creamy flavors with an irresistible flaky crust, the Caramelized Onion Tart with Gorgonzola and Brie Recipe is exactly what you need. This tart is a wonderful blend of deeply caramelized onions, tangy Gorgonzola, and smooth, buttery Brie, all resting on a crisp puff pastry base. It’s a crowd-pleaser that feels fancy but is surprisingly straightforward to make, perfect for a cozy dinner or an impressive appetizer when entertaining.

Ingredients You’ll Need

Getting the ingredients right is key to unlocking the full magic of this tart. Each component contributes something special, from the sweetness of the onions to the creamy bite of the cheeses, ensuring a perfect harmony in every mouthful.

• Extra virgin olive oil (2 tablespoons): Adds a subtle fruity note and helps soften the onions as they caramelize.
• Onions (4 cups, sliced): The star ingredient, these onions become luxuriously sweet and tender when cooked down.
• Brown sugar (1 tablespoon): Enhances the natural sweetness of the onions for deeper caramelization.
• Balsamic vinegar (2 tablespoons): Provides a tangy complexity that complements the sweetness perfectly.
• Salt (1/2 teaspoon): Balances the flavors and draws out moisture.
• Black pepper (1/2 teaspoon): Adds a gentle heat and depth to the dish.
• Frozen puff pastry (8 ounces, 1 sheet): The buttery, flaky foundation that elevates the tart’s texture and presentation.
• Brie cheese (2 ounces, diced): Brings creamy richness without overpowering other flavors.
• Gorgonzola cheese (2 ounces, diced): Offers a bold, tangy punch that contrasts beautifully with the Brie and onions.
• Fresh tarragon (2 tablespoons, chopped): Adds a delicate, slightly sweet herbal note; fennel seeds can be used as a substitute if fresh tarragon isn’t available.

How to Make Caramelized Onion Tart with Gorgonzola and Brie Recipe

Step 1: Caramelize the Onions

Start by heating the olive oil in a large deep pan over medium-high heat. Toss in the sliced onions and cook them for about 10 minutes until they soften and just begin to turn golden. This initial phase is crucial for creating that perfect base of sweet flavor. Next, add the brown sugar, balsamic vinegar, salt, and pepper. Lower the heat and let the onions gently cook uncovered for another 20 to 25 minutes, stirring occasionally. The goal is to achieve a deep, rich caramel color without burning. If the onions begin to stick or dry out, splash in a small amount of water to keep them moist. Once done, allow the onions to cool slightly before you start assembling the tart.

Step 2: Prepare the Puff Pastry

While the onions cool, preheat the oven to 400°F. Roll out your thawed puff pastry sheet into a rectangle roughly 10 to 14 inches, or shape it however you desire. Place it carefully on a parchment-lined baking sheet. To prevent the dough from puffing up too much and creating large bubbles, prick it at even intervals with a fork. This step will ensure your tart bakes with a perfect, flaky and flat base ready to hold the flavorful toppings.

Step 3: Assemble Your Tart

Spread the cooled, caramelized onions evenly over the entire surface of the pastry, making sure to reach the edges for full flavor in every bite. Next, dot the surface with the diced Brie and Gorgonzola cheeses. Their melting qualities will create lovely pockets of creaminess and sharpness throughout the tart. Finally, sprinkle the chopped fresh tarragon on top. If you don’t have tarragon, a pinch of fennel seeds or fresh fennel fronds after baking works beautifully to add a similar aroma and taste.

Step 4: Bake to Perfection

Once assembled, bake your tart in the preheated oven for 18 to 20 minutes. Keep an eye out for that golden puff pastry edge and bubbling cheese – these are your signs that it’s ready. Then, let it cool for about five minutes to settle before cutting it into wedges or squares. This allows the flavors to meld and the cheese to firm up just enough so it doesn’t run everywhere.

How to Serve Caramelized Onion Tart with Gorgonzola and Brie Recipe

Garnishes

Adding simple garnishes can elevate the tart’s flavor and appearance. Fresh tarragon leaves or a small sprinkle of finely chopped fennel fronds bring fresh herbal brightness to every bite. A drizzle of good quality olive oil or a few cracks of freshly ground black pepper right before serving adds a delicious finishing touch.

Side Dishes

This tart pairs wonderfully with fresh, vibrant sides. A crisp green salad dressed with a light vinaigrette complements the richness of the tart nicely. Roasted root vegetables or a bowl of citrusy mixed greens with toasted nuts can create a beautifully balanced meal. It’s equally fabulous alongside soup for a light lunch or brunch option.

Creative Ways to Present

Consider serving the Caramelized Onion Tart with Gorgonzola and Brie Recipe on a rustic wooden board for a casual gathering or on fine white porcelain to impress dinner guests. Cut into smaller squares for party bites or serve large wedges plated with a colorful side for an elegant dinner. For a brunch vibe, add a poached egg on top for an indulgent twist.

Make Ahead and Storage

Storing Leftovers

If you have any leftovers, place them in an airtight container and store them in the refrigerator. They will keep well for up to 3 days, and the flavors actually deepen when rested.

Freezing

You can freeze the tart before baking by assembling it on the baking sheet and wrapping tightly with plastic wrap and foil. When ready to enjoy, simply bake it straight from the freezer—just add a few extra minutes to the baking time.

Reheating

To reheat, warm the tart in a preheated 350°F oven for about 10 minutes or until warmed through and the pastry crisp again. Avoid the microwave if possible to retain the lovely flaky texture of the puff pastry.

FAQs

Can I use fresh onions instead of frozen?

Absolutely! Fresh onions are actually preferred for this recipe to caramelize properly and deliver that sweet, rich flavor. Just make sure to slice them evenly for consistent cooking.

What if I don’t have tarragon? Is there a substitute?

If fresh tarragon isn’t available, crushed fennel seeds or fresh fennel fronds are excellent alternatives that offer a similar aromatic note, keeping the dish vibrant and herbaceous.

Can I make the tart vegetarian?

This recipe is already vegetarian-friendly as it uses cheeses and vegetables. Just double-check your puff pastry ingredients to ensure they don’t contain any animal fats for a fully vegetarian dish.

Is there a way to make this tart gluten-free?

Yes, you can use a gluten-free puff pastry available in some specialty stores or make your own if you have the time. The key is to maintain the flaky texture similar to traditional puff pastry.

How long does it take to caramelize the onions?

The caramelization process takes about 30 to 35 minutes in total, including the initial softening and the slow gently browning stage. This time is essential for the deep flavor development of the onions.

Final Thoughts

Now that you know the secrets behind this absolutely delicious Caramelized Onion Tart with Gorgonzola and Brie Recipe, I can’t wait for you to try it yourself. It’s that perfect blend of sweet onions, tangy cheese, and flaky pastry that makes every bite a bit of a celebration. Whether for a special occasion or a cozy night in, this tart will become one of your favorites too!

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