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Step-by-Step Instructions
1. Prepare the Pastry Crust
- Make the Dough: In a food processor, combine the flour and salt. Add the chilled butter and pulse until the mixture resembles coarse crumbs. Slowly add the cold water, a tablespoon at a time, until the dough begins to come together.
- Chill the Dough: Turn the dough out onto a lightly floured surface and knead it briefly. Form it into a disk, wrap it in plastic wrap, and refrigerate for at least 30 minutes. This will make the dough easier to roll out.
- Roll the Dough: After the dough has chilled, roll it out on a floured surface to fit a tart pan (about 9 inches). Press the dough into the pan and trim any excess around the edges. Place the tart shell in the fridge while you prepare the filling.
2. Caramelize the Onions
- Cook the Onions: In a large skillet, heat the olive oil and butter over medium heat. Add the sliced onions and cook, stirring occasionally. Sprinkle the onions with sugar to help them caramelize.
- Slow Cook: Continue to cook the onions for about 20-25 minutes, or until they are soft, golden, and deeply caramelized. Stir frequently to prevent them from burning. Season with salt and pepper to taste. Remove from heat and let them cool for a few minutes.
3. Prepare the Filling
- Mix the Filling: In a medium bowl, whisk together the heavy cream, egg, and thyme. Stir in the caramelized onions, and then fold in the grated Gruyère and Parmesan cheeses. The mixture should be thick and creamy.
- Assemble the Tart: Preheat your oven to 375°F (190°C). Pour the onion mixture into the prepared tart shell and spread it evenly.
4. Bake the Tart
- Bake: Place the tart on the middle rack of the oven and bake for about 30-35 minutes, or until the crust is golden and the filling is set.
- Cool and Serve: Allow the tart to cool slightly before slicing. You can serve it warm or at room temperature, and garnish with a few fresh thyme sprigs or some additional grated cheese for extra flavor.
Tips for a Perfect French Onion Tart
- Caramelize the onions slowly: The key to a flavorful French Onion Tart is caramelizing the onions slowly over medium heat. The longer they cook, the sweeter and more complex the flavor will be.
- Use a combination of cheeses: Gruyère is the classic cheese used in French onion soup, and its nutty flavor pairs beautifully with the caramelized onions. Adding Parmesan cheese enhances the tart’s richness and flavor.
- Chill the dough: Don’t skip the step of chilling the dough. This ensures a crisp and flaky crust that holds the filling well without becoming soggy.
Serving Suggestions
A French Onion Tart is a versatile dish that pairs well with many different sides and beverages. Here are a few ideas to complete your meal:
- A fresh green salad: A simple salad with arugula, spinach, or mixed greens will balance the rich and savory flavors of the tart.
- Wine pairing: A light, crisp white wine, such as Chardonnay or Sauvignon Blanc, will complement the flavors of the tart. For red wine lovers, a medium-bodied red like Pinot Noir will work well too.
- Soup: Serve alongside a light soup, like a fresh tomato basil or a simple vegetable soup, for a comforting and filling meal.
Conclusion
This French Onion Tart is an incredible dish that brings together the best aspects of French cuisine: rich flavors, buttery pastry, and comforting ingredients. Whether you’re preparing it for a family meal, a dinner party, or a holiday gathering, it’s a guaranteed crowd-pleaser. With its deep, savory onion flavor and creamy cheese filling, this tart is a perfect way to elevate your cooking game.
So, gather your ingredients, get ready to bake, and savor every bite of this delightful French Onion Tart!
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