Onion Tart Recipe: Savory, Buttery & Flavorful Dish
When I made this onion tart last weekend, I couldn’t believe how easy it was to bring such an elegant dish to life. Think golden, caramelized onions resting on a creamy bed of Greek yogurt, all on top of a buttery, flaky puff pastry crust.
It’s simple but feels like something straight out of a chic café menu. My family devoured it as an appetizer, lunch, and even as leftovers the next day!
What I love most is how versatile this tart is. Whether you’re serving it at a party or indulging by yourself, it delivers that perfect balance of simplicity and sophistication every time.
Ingredients You’ll Need
Make every ingredient count for the ultimate savory, flaky tart!
- 3 large sweet onions, thinly sliced: Sweet onions offer a natural caramel-like flavor perfect for this dish.
- 2 tablespoons olive oil: Helps sauté the onions to golden perfection without burning.
- 1 sheet puff pastry (store-bought or homemade): Be sure to thaw store-bought pastry overnight for best results.
- 1 egg whisked with 1 tablespoon water: A simple egg wash gives the pastry its gorgeous golden color.
- ½ cup Greek yogurt: Adds a tangy yet creamy contrast to the rich onions.
- 2 tablespoons grated Parmesan cheese: Freshly grated for that extra nutty, savory kick.
- 1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme): Adds a fragrant touch that pairs beautifully with the onions.
- Salt and pepper to taste: Seasoning ties the flavors together perfectly.
Note: This recipe serves about 4 people as a light dish or appetizer portion.
Variations to Try
Feel free to tweak the ingredients to suit your preferences!
- Go Dairy-Free: Use coconut yogurt and a vegan cheese alternative like nutritional yeast.
- Add Protein: Crumbled cooked bacon or smoked salmon will add richness and depth.
- Vegetarian Boost: Add sliced cherry tomatoes or sautéed zucchini for a pop of color and flavor.
- Cheese Swap: Substitute Parmesan with Gruyère or goat cheese for a different twist.
Cooking Time
You’ll have a restaurant-style dish ready in under an hour!
- Prep Time: 10 minutes
- Cooking Time: 35 minutes
- Total Time: 45 minutes
Equipments You’ll Need
Stock your kitchen with these essentials for a stress-free cooking process.
- Chef’s knife: Makes slicing onions easier and more precise.
- Large skillet: For sautéing onions to golden perfection.
- Baking sheet: Provides a flat surface to evenly bake the tart.
- Parchment paper: Prevents sticking and makes cleanup a breeze.
- Pastry brush: Spreads egg wash evenly without dripping.
How to Make Onion Tart?
Here’s a step-by-step guide to help you create this stunning tart.
Caramelize the Onions
Start by heating olive oil in a skillet over medium-low heat. Add your sliced onions with a pinch of salt and stir occasionally. Cook slowly for about 15-20 minutes until they’re soft, golden brown, and caramelized. Remove from the heat and set aside to cool.
Prepare the Puff Pastry
Roll out the puff pastry into a 10×10-inch square on parchment paper. If using store-bought pastry, thaw it thoroughly and trim any uneven edges. Lightly score a 1-inch border around the edges to create a crust. This border will puff up as it bakes to frame your tart.
Add a Layer of Flavor
Brush the border of the pastry with egg wash to ensure a golden, crisp crust. Spread the Greek yogurt evenly over the center of the pastry, steering clear of the edges. Sprinkle freshly grated Parmesan over the yogurt for a cheesy layer of flavor.
Assemble the Topping
Top the yogurt mixture with your cooled caramelized onions, spreading them evenly across the center. Sprinkle thyme leaves on top, and season generously with salt and pepper.
Bake to Perfection
Preheat your oven to 400°F (200°C). Slide the parchment paper and tart onto a baking sheet, then bake for 20-25 minutes. The pastry should be golden brown and puffed around the edges. Once baked, cool the tart for 10 minutes before slicing and serving.
Additional Tips for Making this Recipe Better
After making this tart a few times, I’ve found these tips make a world of difference!
- Don’t Rush the Onions: Slow cooking is key to caramelizing natural sugars in the onions without burning them.
- Egg Wash Carefully: Be precise while brushing the egg wash to avoid sealing the edges of the puff pastry layers.
- Cool Before Serving: This allows the flavors to meld together for a more cohesive and delicious bite.
How to Serve Onion Tart in Style?
Pair this tart with light sides or serve it alone for ultimate versatility. For an elegant starter, slice the tart into bite-sized squares and serve on a pretty platter. Garnish with a sprinkle of fresh thyme for a touch of color.
If serving for lunch, pair it with a simple green salad tossed in tangy vinaigrette to balance the richness of the tart. For a hearty brunch, add scrambled eggs, fruit, and coffee for a complete meal.
Nutritional Information
A slice of this tart carries rich flavors without overloading on calories.
- Calories: 190
- Protein: 4g
- Carbohydrates: 15g
- Fat: 13g
Make Ahead and Storage
Here’s how to enjoy your tart later without compromising its quality.
- Make Ahead: Prep the caramelized onions and puff pastry the day before assembly to save time.
- Store Leftovers: Keep slices in an airtight container in the fridge for up to 3 days. Reheat in a 375°F (190°C) oven for 5-7 minutes to restore crispness.
- Freezing Not Recommended: The texture of the puff pastry may change when frozen and reheated.
Why You’ll Love This Recipe?
This onion tart is a guaranteed hit, and here’s why you’ll adore it!
- Easy to Make: With just a few simple steps, you can have a gourmet dish ready in no time.
- Flavor-Packed: Caramelized onions, yogurt, and cheese create a perfectly balanced taste.
- Versatile and Adaptable: Adjust the recipe to suit your preferences and dietary needs.
- Perfect for Any Occasion: Whether it’s brunch, a party, or date night, this tart fits right in.
Once you take a bite of this flaky, savory, flavor-packed tart, I’m sure you’ll agree it’s destined to become a household favorite! Enjoy every delicious moment.
Onion Tart Recipe
Ingredients
Method
- Start by heating olive oil in a skillet over medium-low heat. Add your sliced onions with a pinch of salt and stir occasionally. Cook slowly for about 15-20 minutes until they’re soft, golden brown, and caramelized. Remove from the heat and set aside to cool.
- Roll out the puff pastry into a 10×10-inch square on parchment paper. If using store-bought pastry, thaw it thoroughly and trim any uneven edges.
- Lightly score a 1-inch border around the edges to create a crust. This border will puff up as it bakes to frame your tart.
- Brush the border of the pastry with egg wash to ensure a golden, crisp crust. Spread the Greek yogurt evenly over the center of the pastry, steering clear of the edges. Sprinkle freshly grated Parmesan over the yogurt for a cheesy layer of flavor.
- Top the yogurt mixture with your cooled caramelized onions, spreading them evenly across the center. Sprinkle thyme leaves on top, and season generously with salt and pepper.
- Preheat your oven to 400°F (200°C). Slide the parchment paper and tart onto a baking sheet, then bake for 20-25 minutes. The pastry should be golden brown and puffed around the edges. Once baked, cool the tart for 10 minutes before slicing and serving.
Notes
- Don’t Rush the Onions: Slow cooking is key to caramelizing natural sugars in the onions without burning them.
- Egg Wash Carefully: Be precise while brushing the egg wash to avoid sealing the edges of the puff pastry layers.
- Cool Before Serving: This allows the flavors to meld together for a more cohesive and delicious bite.
