We often think of onions as background flavor—the base of a soup, the start of a sauce, the thing you caramelize to add depth. But what if we let onions take center stage? This savory onion tart does exactly that. It transforms everyday yellow onions into a golden, herb-infused showstopper that’s as elegant as it is easy.

Savory Onion Tart with caramelised half-sliced onions on cheesy puff pastry golden flakey crust

This recipe is my tribute to one of the most humble yet powerful ingredients in the kitchen. Like potatoes, onions can wear many hats. They’re sweet, sharp, soft, rich, savory—depending on how you prepare them. And here, cooked gently in herbs and vegan butter, then topped with golden puff pastry, they become the main event.

It’s the kind of dish that surprises people. One bite and they’re hooked. The contrast between the flaky crust and the tender, caramelized onions is irresistible. Plus, it’s affordable, simple to prep, and looks like something out of a French countryside cookbook.

Additionally, you can play around with this base recipe: mix in red onions or shallots, add sun-dried tomatoes for depth, or sprinkle in chili flakes for a little heat. It’s flexible, approachable, and makes a perfect lunch, brunch centerpiece, or weeknight dinner with a fresh green salad.

So, let’s give onions their moment in the spotlight.

💛 Why You’ll Love This Savory Onion Tart

🧅 Onion-Forward: A recipe that finally puts onions front and center. As a result, they truly shine.
🥧 Easy to Make: No complicated doughs—just store-bought puff pastry. This saves both time and effort.
🌱 Vegan-Friendly: Dairy-free, egg-free, and full of natural flavor. Therefore, it’s perfect for plant-based eaters.
🧄 Herb-Infused: Garlic, rosemary, and parsley bring warmth and depth. In other words, this tart is anything but bland.
✨ Customizable: Add sun-dried tomatoes, mixed onions, or your favorite spices to make it your own.
⏱️ Quick Cook Time: Just 10 minutes prep + 40 minutes cook, so it’s ideal for busy days.

As you can see, there’s a lot to love in this savory little tart.

Print Recipe

How to Make a Savory Onion Tart – Easy, Vegan & Irresistibly Flavorful

This savory onion tart is easy, affordable, and packed with flavor. Made with caramelized onions, puff pastry, and herbs—vegan and irresistible!

Prep Time10

Cook Time40

Total Time50

Course: Main Course

Cuisine: French

Keyword: caramelized onion tart, easy vegan baking recipe, onion puff pastry, onion recipes, plant-based appetizer, puff pastry tart, savory onion tart, simple vegan lunch, vegan savory pie, vegan tart

Servings: 8 portions

Calories: 157kcal

Ingredients

700 g yellow onions about 5–6 medium
½ pack puff pastry store-bought, vegan
25 g margarine or vegan butter or oil/coconut oil
1 tbsp rosemary fresh or dried
1 tbsp fresh parsley or dried
1 tbsp garlic minced or powder
1 tsp salt
1 tsp black pepper
30 g shredded vegan cheese optional but recommended

Instructions

Step 1: Prep the Onions

Peel and cut the onions in half lengthwise.

Step 2: Sauté the Base

Heat a 28cm frying pan over medium heat. Add margarine, then stir in rosemary, parsley, garlic, salt, and pepper until evenly combined.

Step 3: Cook the Onions

Place the onion halves cut-side down in the pan. Cover with a lid and let them cook for about 15 minutes until lightly golden.

Step 4: Preheat the Oven

While onions cook, preheat your oven to 180°C (350°F).

Step 5: Add Vegan Cheese (Optional)

Remove the lid and sprinkle the onions with shredded vegan cheese.

Step 6: Prepare the Puff Pastry

Cut the puff pastry into a 28cm round to fit your pan. Place it over the onions and press gently around the edges to seal.

Step 7: Bake

Transfer the pan to the oven and bake for 20 minutes, or until the pastry is golden brown and puffed.

Step 8: Flip and Serve

Remove the tart from the oven. Place a plate over the pan and carefully flip the tart out so the onions face up.

🍽️ Tips & Variations

Add sun-dried tomatoes for a flavor boost
Mix red and yellow onions for color and complexity
Try a pinch of chili flakes if you like a little heat
Serve with a green salad for a complete meal

Even better, feel free to adapt this recipe to whatever you have on hand.

❓ Frequently Asked Questions

Can I use red or white onions instead?
Yes! A mix of onions adds depth and visual appeal.

Do I have to use vegan cheese?
Not at all—it’s optional. However, the tart is still delicious without it.

Can I make it gluten-free?
Use a gluten-free puff pastry for a fully gluten-free version. This makes it accessible for more dietary needs.

How should I store leftovers?
Store covered in the fridge for up to 3 days. Then, reheat in the oven to crisp the pastry.
Store covered in the fridge for up to 3 days. Reheat in the oven to crisp the pastry.