Onion Tart Recipe

Rating 5.0
| 1
| Last Updated on May 7, 2024
This onion tart features a homemade puff pastry and a delicious caramelized onion filling. Large enough to feed a crowd, this delicious dish can be served as an appetizer or a main course when served with sides.
Utensils Appetizer
Globe French
18
ingredients
17
steps
215
minutes
Chef Annie became enamored with cooking at an early age, teaching herself to prepare complex dishes like duck confit as a teenager. She built a career in accounting before making the leap to culinary school to study baking and pastry arts. She began a business as a private chef while selling her own baked creations on the side. With her transition to culinary instructor, Chef Annie now brings her talents to an exciting new arena.

Ingredients

Servings:
8
For the Rough Puff Pastry (See notes 1)
1 1/2 cup(s)
all-purpose flour, plus 1 tablespoon
1/2 tsp
salt
1/4 tsp
granulated sugar
15 tbsp
cold unsalted butter, cubed
6 1/2 tbsp
ice-cold water
For the Onion Filling
2 tbsp
unsalted butter
2 tbsp
olive oil
2
large yellow onions, sliced ΒΌ-inch thick
1
leek, thinly sliced
2 tbsp
granulated sugar
1/4 tsp
allspice
1/2 tsp
salt
1/4 tsp
black pepper
3
garlic cloves, minced
1 cup(s)
ricotta cheese
1
large egg
1/2 cup(s)
shredded Gruyere cheese
3
sprigs of thyme
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Directions 17 steps | 215 Minutes

Step 1

Measure and prep all ingredients.

Onion Tart Recipe: Measure and prep all ingredients.
Step 2

Prepare the rough puff pastry. In a large bowl, add the all-purpose flour, salt and sugar. Mix until combined. Add the cold butter and coat the butter with the flour. 

Onion Tart Recipe: Prepare the rough puff pastry.
Step 3

Add the ice cold water and mix with a fork to hydrate the flour. 

Onion Tart Recipe: Add the ice cold water and mix with a fork to hydrate the flour.
Step 4

Work the dough with your hands quickly so the butter does not melt. You want to make sure you still have some large chunks of butter mixed in.

Onion Tart Recipe: Work the dough with your hands quickly so the butter does not melt.
Step 5

Once a shaggy dough has formed, turn the dough out onto a lightly floured countertop. Bring the dough together into a disc and flatten slightly. You should still see nice chunks of butter throughout the dough. Wrap the dough in plastic wrap and place it in the refrigerator for 2 hours. 

Onion Tart Recipe: Once a shaggy dough has formed, turn the dough out onto a lightly floured countertop.
Step 6

After the 2 hours, take the dough out of the refrigerator and onto a lightly floured surface. Roll the dough out to a 13x7-inch rectangle. 

Onion Tart Recipe: After the 2 hours, take the dough out of the refrigerator and onto a lightly floured surface.
Step 7

Fold the dough into thirds, similar to folding a letter. 

Onion Tart Recipe: Fold the dough into thirds, similar to folding a letter.
Step 8

Turn clockwise and roll the dough back out to a 13x7-inch rectangle and fold it into a letter again. Repeat this process four more times for a total of six times. Cover the folded dough with plastic wrap and refrigerate for 30 minutes to an hour before use. (See notes 2.) 

Onion Tart Recipe: Turn clockwise and roll the dough back out to a 13x7-inch rectangle and fold it into a letter again.
Step 9

When ready to use, roll the dough out in a 17x10-inch rectangle. Place on a baking sheet lined with parchment paper. Score around the tart, one inch away from the edge to create a border. Make sure you lightly score and do not cut off the pastry's edge. Place the sheet pan in the refrigerator until ready to use.

Onion Tart Recipe: When ready to use, roll the dough out in a 17x10-inch rectangle.
Step 10

Prepare the onion filling. In a large pan over medium heat, melt the butter and olive oil. Add the sliced onions, leeks, sugar, allspice, salt and pepper. Sauté until the onions are caramelized.

Onion Tart Recipe: Prepare the onion filling.
Step 11

Once the onions have carmelized, add the garlic for a couple of minutes and remove from heat. Taste and if needed, adjust seasoning with salt and pepper. 

Onion Tart Recipe: Once the onions have carmelized, add the garlic for a couple of minutes and remove from heat.
Step 12

Assemble the onion tart. Preheat the oven to 400°F. In a medium bowl, add the ricotta and the egg. Mix until combined. 

Onion Tart Recipe: Assemble the onion tart.
Step 13

Add the ricotta filling to the middle of the tart and spread evenly within the border line of the tart.

Onion Tart Recipe: Add the ricotta filling to the middle of the tart and spread evenly within the border line of the tart.
Step 14

Next, add the onion mixture over the ricotta mixture and spread it evenly. 

Onion Tart Recipe: Next, add the onion mixture over the ricotta mixture and spread it evenly.
Step 15

Pull the leaves from the thyme sprigs and add them to the shredded Gruyere. Mix together. 

Onion Tart Recipe: Pull the leaves from the thyme sprigs and add them to the shredded Gruyere.
Step 16

Finally, sprinkle the Gruyere cheese mixture evenly over the tart. 

Onion Tart Recipe: Finally, sprinkle the Gruyere cheese mixture evenly over the tart.
Step 17

Bake in the oven for 20-25 minutes. The tart dough should be golden brown. Slice, serve and enjoy!

Onion Tart Recipe: Bake in the oven for 20-25 minutes.

Notes:

  1. You can also use store-bought puff pastry sheets.
  2. You can make this the night before as well.

Nutrition Per Serving
View All
CALORIES
456
FAT
34.1 g
PROTEIN
8.6 g
CARBS
30.1 g
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1 Comments
1 Comments
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Carmela G.

Carmela

Cozymeal Team Member

27 Jul 2023

This Onion Tart Recipe is delicious. Perfect for about anything.

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