The Sweet Potato, Feta & Caramelised Onion Tart is a stunning vegetarian dish that always manages to steal the show whether it’s laid out for lunch, a light dinner, or sliced up as a party appetizer. The sweetness of tender sweet potatoes, punchy crumbles of feta, and melt-in-your-mouth caramelised onions are all wrapped in flaky, golden puff pastry, making every bite utterly irresistible. This tart is a firm family favorite in my home, thanks to its vibrant colors, deliciously complex flavors, and the way it turns simple ingredients into something that feels so special. Whether you’re a seasoned cook or just whipping up something quick for friends, you’ll find yourself coming back to this recipe again and again, and trust me, it never disappoints!
Ingredients You’ll Need
The ingredient list for Sweet Potato, Feta & Caramelised Onion Tart keeps things refreshingly simple while packing in layers of flavor and color. Each component has a real role to play, from providing structure to boosting the taste, and a couple of helpful shortcuts make this recipe weeknight-friendly, too.
- Puff pastry: The foundation of the tart; using store-bought makes things so much quicker and guarantees a crispy, golden crust every time.
- Sweet potatoes: Thinly sliced for beautiful layers, they’re naturally sweet, creamy, and provide gorgeous color.
- Olive oil: Used to sauté and soften veggies, adding a welcome richness and a hint of fruitiness.
- Onions: The star in the caramelised mix, bringing deep, sweet-savory flavor to the filling.
- Butter: Combined with olive oil for caramelising, it boosts both flavor and silkiness in the onions.
- Brown sugar: Just a teaspoon, but it makes the onions irresistibly jammy and golden.
- Balsamic vinegar: Adds tang and depth, accentuating all the naturally sweet elements in the tart.
- Dried thyme: A little goes a long way for a herby, earthy background note.
- Salt: Essential for enhancing all the flavors—never skip it!
- Black pepper: Adds just a touch of warmth to round things out.
- Feta cheese: Salty, tangy, crumbly, and creamy, feta is what makes every slice sing.
- Egg: Brushing the edges gives the pastry that irresistible golden finish.
- Fresh thyme or arugula: Your pick for garnish! Either adds appealing freshness just before serving.
How to Make Sweet Potato, Feta & Caramelised Onion Tart
Step 1: Caramelise the Onions
Start by slowly caramelising the onions in a skillet with olive oil and butter over medium heat. Take your time here—giving the onions a good 20 to 25 minutes to turn deeply golden and gorgeous brings out their natural sweetness and creates that jammy texture that’s the secret to a truly great Sweet Potato, Feta & Caramelised Onion Tart. Finish with brown sugar, balsamic vinegar, thyme, salt, and pepper to make the flavor pop.
Step 2: Prepare the Sweet Potatoes
While your onions are working their magic, steam or roast the sliced sweet potatoes for about five to seven minutes. The sweet potatoes should be just tender (think al dente), so they hold their shape after baking and create those lovely, vibrant layers in your tart.
Step 3: Prep the Pastry
Roll out the puff pastry on a parchment-lined baking sheet for easy clean-up and transfer. Use a sharp knife to score a border about one inch from the edge—this helps separate the crispy crust from the filling and creates that classic tart “frame” you see in bakeries.
Step 4: Assemble the Tart
Next, spread the luscious caramelised onions evenly within your scored border for the base layer of deliciousness. Arrange the sweet potato slices on top in overlapping circles or rows. Sprinkle over crumbled feta for tangy, creamy contrast. Brush the exposed pastry border with beaten egg for that bakery-worthy shine.
Step 5: Bake to Perfection
Bake your Sweet Potato, Feta & Caramelised Onion Tart in a preheated 400°F oven for 25 to 30 minutes, until the pastry is beautifully golden and puffed, and the edges look irresistible. The kitchen will smell amazing at this point, and you’ll know it’s almost time to feast!
Step 6: Garnish and Serve
Once out of the oven, finish with a handful of fresh thyme leaves or a sprinkle of arugula for a peppery, vibrant touch. Let the tart cool for a few minutes so slicing is easier and so the flavors have a chance to meld together perfectly.
How to Serve Sweet Potato, Feta & Caramelised Onion Tart
Garnishes
The simplest way to elevate your Sweet Potato, Feta & Caramelised Onion Tart is to shower it with fresh herbs—think lots of fresh thyme or some zesty arugula for brightness and a pop of color. If you’re feeling indulgent, a light drizzle of honey balances the salty feta and savory onions beautifully.
Side Dishes
This tart loves a little company! Serve it warm alongside a crisp, lemony green salad or a tangle of lightly dressed arugula. It also pairs beautifully with roasted vegetables or a simple soup, such as tomato or butternut squash, making a cozy and complete vegetarian meal.
Creative Ways to Present
For dinner parties, slice the tart into elegant squares for an appetizer or party platter. You can also fold and overlap the pastry edges slightly for a rustic, galette-style look that feels chic and homemade. If you’re hosting brunch, try serving each slice with a dollop of Greek yogurt and a few extra thyme leaves for maximum wow factor!
Make Ahead and Storage
Storing Leftovers
If you have any Sweet Potato, Feta & Caramelised Onion Tart leftover (and that’s a big if!), place slices in an airtight container and refrigerate for up to three days. The pastry will stay pleasantly crisp for a day or so, and the flavors only deepen as they mingle in the fridge.
Freezing
Freezing is a great option for planning ahead. Allow the tart to cool completely, then wrap slices tightly in foil or place them in freezer-safe containers. Freeze for up to two months—just make sure to thaw in the refrigerator overnight before reheating for best texture.
Reheating
For the crispiest crust, reheat leftover tart slices in a preheated oven at 350°F for 10 to 12 minutes. Avoid the microwave if you can, as it softens the pastry. If you’re in a hurry, a few minutes in a toaster oven also revives the tart beautifully.
FAQs
Can I use another cheese instead of feta?
Absolutely! Goat cheese works wonderfully for a similar tangy creaminess, or try a mild blue cheese for something bolder. Mozzarella brings extra meltiness, though you’ll lose a bit of the signature sharpness that feta brings to the Sweet Potato, Feta & Caramelised Onion Tart.
Do I have to caramelise the onions, or can I just sauté them?
While you can use sautéed onions in a pinch, taking the extra time to slowly caramelise them is worth every minute. It gives you that complex, sweet-savory base that makes this tart shine, setting the Sweet Potato, Feta & Caramelised Onion Tart apart from any ordinary vegetable tart.
Is it possible to make this tart gluten-free?
Yes! Just swap the standard puff pastry for your favorite gluten-free alternative. More gluten-free puff pastry brands have become available lately, so you can still enjoy everything you love about this tart—no compromises needed.
Can I prepare parts of the tart ahead of time?
Definitely. You can caramelise the onions and even slice (or par-cook) the sweet potatoes a day ahead. Store them covered in the refrigerator, and when you’re ready to make the Sweet Potato, Feta & Caramelised Onion Tart, simply assemble and bake as directed.
What other vegetables can I add to the tart?
You’re welcome to get creative! Try layering in thinly sliced zucchini, roasted red peppers, or even spinach for added flavor and color. Just be sure to avoid veggies that are too watery, so your tart stays crisp and flaky.
Final Thoughts
If you’re craving something warm, comforting, and full of character, you simply have to try making a Sweet Potato, Feta & Caramelised Onion Tart. It’s versatile enough for weekday dinners, crowd-pleasing enough for holidays, and easy enough to add to your regular rotation. I hope you adore this recipe as much as I do—don’t be surprised if it becomes your new go-to, too!
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Sweet Potato, Feta & Caramelised Onion Tart Recipe
- Total Time: 50 minutes
- Yield: 6 servings 1x
- Diet: Vegetarian
Description
Indulge in the delightful flavors of this Sweet Potato, Feta & Caramelised Onion Tart that combines the sweetness of caramelized onions, the creaminess of feta cheese, and the earthy sweetness of sweet potatoes on a flaky puff pastry base.
Ingredients
Puff Pastry:
- 1 sheet puff pastry, thawed
Sweet Potato:
- 2 medium sweet potatoes, peeled and thinly sliced
Caramelised Onions:
- 2 tablespoons olive oil
- 2 large onions, thinly sliced
- 1 tablespoon butter
- 1 teaspoon brown sugar
- 1 teaspoon balsamic vinegar
- 1/2 teaspoon dried thyme
- 1/2 teaspoon salt
- 1/4 teaspoon black pepper
Additional Ingredients:
- 4 ounces feta cheese, crumbled
- 1 egg, beaten (for brushing)
- Fresh thyme or arugula for garnish
Instructions
- Preheat and Prepare: Preheat the oven to 400°F and line a baking sheet with parchment paper.
- Caramelize Onions: In a skillet, warm olive oil and butter, add onions, cook until golden, then add sugar, vinegar, thyme, salt, and pepper.
- Prepare Sweet Potatoes: Steam or roast sweet potato slices until tender.
- Assemble Tart: Roll out puff pastry, add caramelized onions, sweet potato slices, and feta. Brush edges with egg.
- Bake: Bake for 25–30 minutes until golden. Garnish with thyme or arugula before serving.
Notes
- For extra richness, drizzle with honey before serving.
- You can also swap the feta for goat cheese.
- This tart is delicious served warm as a main dish or cut into small squares as an appetizer.
- Prep Time: 20 minutes
- Cook Time: 30 minutes
- Category: Main Course, Appetizer
- Method: Baking
- Cuisine: Mediterranean, European
Nutrition
- Serving Size: 1 slice
- Calories: 310
- Sugar: 7 g
- Sodium: 310 mg
- Fat: 19 g
- Saturated Fat: 8 g
- Unsaturated Fat: 10 g
- Trans Fat: 0 g
- Carbohydrates: 30 g
- Fiber: 3 g
- Protein: 6 g
- Cholesterol: 40 mg
