Caramelized Onion Tart
A savory tart featuring sweet caramelized onions and Parmesan cheese atop flaky puff pastry, perfect for elegant dinners or brunch gatherings with rich, sweet, and cheesy flavors.
Ingredients
Instructions
- Cook onions in hot olive oil in a large skillet over low heat, stirring often, for 30 to 35 minutes until caramelized.
- Stir in salt and set the onion mixture aside.
- Unfold the frozen puff pastry sheet and fit into a 9-inch square tart pan.
- Bake at 400°F for 15 to 20 minutes or until browned.
- Remove from oven and press the pastry with the back of a spoon to flatten.
- Top the pastry with the caramelized onions.
- Sprinkle with shredded Parmesan cheese.
- Bake for an additional 5 minutes until cheese is melted and bubbly.
Tips & Substitutions
For best results, use sweet onions like Vidalia or Walla Walla for a rich flavor. If you don't have Parmesan, try Gruyère or a sharp cheddar as a substitute. To save time, you can use store-bought caramelized onions. Keep an eye on the pastry while baking to prevent over-browning, and feel free to add herbs like thyme for extra depth.
Serving Suggestions
This caramelized onion tart is perfect as an appetizer or a light lunch. Serve alongside a crisp green salad or pair it with a charcuterie board for a delightful brunch spread. It also complements a glass of white wine beautifully, making it a great addition to gatherings or special occasions. For more ideas, check out other vegetarian recipes.
Storage & Reheating
Store any leftovers in an airtight container in the refrigerator for up to 3 days. To reheat, place the tart in a preheated oven at 350°F for about 10 minutes until warmed through. Avoid microwaving, as it can make the pastry soggy.
Nutrition & Diet Analysis (per serving)
Each serving of Caramelized Onion Tart contains roughly 84 calories, with 3g protein, 3g carbohydrates, and 7g fat. Note that it is relatively high in sodium, at 959mg per serving (42% of the Daily Value).
Estimated from ingredients & per-serving nutrition — verify against package labels for allergies or strict diets.
* % Daily Values based on a 2,000 calorie diet (FDA 2020).
Frequently Asked Questions
Can I make the tart in advance?
Yes, you can prepare the caramelized onions and assemble the tart a few hours ahead of time. Just keep it covered in the refrigerator until you're ready to bake. However, it's best to bake it fresh for optimal texture and flavor.
How do I know when the onions are properly caramelized?
The onions should be golden brown and have a sweet, rich flavor. This process takes time, usually around 30 to 35 minutes on low heat. Stir them frequently to ensure even cooking and prevent burning.
Can I use a different type of pastry?
Yes, while puff pastry gives a light and flaky texture, you can use a pie crust or even a phyllo dough for a different style. Just adjust the baking time as needed, depending on the type of pastry you choose.
Nutrition is estimated from USDA FoodData Central ingredient data and may vary with brand, portion and preparation — see our methodology. This information is for general educational purposes only and is not medical or dietary advice (disclaimer).