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Home > All Recipes > French Pastry Recipes

Classic Onion Tart Recipe

Modified: Jul 7, 2026 by Judith E. Coates · This post may contain affiliate links · Leave a Comment

This delicious French Onion Tart is a classic. It comes together quickly and easily, filling your home with a delicious aroma.
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A yellow onion custard tart.

Tarte À l'Oignon

This classic onion tart recipe is so delicious, and it will give you a substantial meal for lunch or supper, or when you want a great-tasting cold snack. A scrumptious quiche made with a light, partly cooked pastry shell with an onion filling that will make your taste buds tingle!

Other classic egg recipes to delight in are Leek And Gruyere Tart, French Scrambled Eggs called La Piperade, or Cheese Souffle Recipe.

A yellow onion custard tart.
Jump to:
  • Tarte À l'Oignon
  • About Classic Onion Tart Recipe
  • How To Serve
  • What To Serve With This Recipe
  • ❔Classic Onion Tart Recipe FAQ
  • More Tasty Recipes To Make And Love
  • 📖 Recipe

About Classic Onion Tart Recipe

We all know that the French know their onions; they are used often in all kinds of dishes and sauces, so it comes as no surprise that they enjoy them in this gorgeous pastry dish.

How To Serve

You don't need a fancy quiche dish for this one as traditionally it would have been made in a straight-sided dish or tin without the fancy edges.

This quiche is tasty at any time of the year, cold with salads in the summer or hot straight from the oven to warm you on a cold winter's day.

It will serve five to six people well, depending on how good you are with the portions. You will probably want a good-sized piece all for yourself; it is so good.

What To Serve With This Recipe

This onion tart recipe is sure to be a favorite! It is so tasty and will go down well with a green salad and a glass of your favorite wine.

It is also easy to make and is a very economical meal for a hungry family!

❔Classic Onion Tart Recipe FAQ

What are the four types of tarts that the Classic Onion Tart Recipe is in one part?

There are four main types of tarts: fruit tarts, custard tarts, chocolate tarts, and savory tarts, like the Classic Onion Tart Recipe.

What kind of tart is the Classic Onion Tart Recipe?

The Classic Onion Tart Recipe is a savory custard tart.

What is the difference between a tart like the Classic Onion Tart Recipe and a pie?

A tart like the Classic Onion Tart Recipe has a bottom crust with an open top over the filling. But a pie has a bottom crust and a top crust with the filling between them.

More Tasty Recipes To Make And Love

  • Classic French Onion Soup Recipe
  • Mouthwatering Strawberry Tart Recipe
  • Quiche Lorraine
  • Plum Tart Recipe

📖 Recipe

Prep Like a Pro
Before you start cooking, chop, measure, and prep every ingredient, and gather your tools.
This simple habit reduces stress, prevents overcooking, and instantly improves your meals. Mise en Place - "Everything in its place."

A yellow onion custard tart.

Classic Onion Tart Recipe

Judith Coates
This delicious French Onion Tart is a classic. It comes together quickly and easily, filling your home with a delicious aroma.
Print Recipe Pin
Prep Time 15 minutes mins
Cook Time 55 minutes mins
Total Time 1 hour hr 10 minutes mins
Course lunch
Cuisine French
Servings 6

Ingredients

  • 1 pastry shell partially cooked
  • 3 cup onions finely sliced
  • 4 tablespoon butter
  • 3 eggs free range if you can get these
  • 1 cup double cream
  • ½ cup Gruyère cheese grated
  • 1 pinch nutmeg grated
  • 2 teaspoon thyme leaves
  • Salt and pepper to taste
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Instructions
 

  • Preheat oven to 350°F (180°C/Gas 4)
  • Your pastry shell should be just cooked but still pale in colour.
  • Melt the butter in a heavy based pan and cook the onions gently until they are just cooked and golden brown in colour.
  • Stir in the thyme leaves and leave to cool.
  • Whisk the eggs lightly then whisk in the cream.
  • Add the cheese and the salt and pepper to taste.
  • Fill the pastry shell with the onions.
  • Pour the egg and cream mixture over the onions.
  • Bake for about 30-45 minutes or until golden brown and the egg mixture has puffed up. Smells and tastes yummy!

Notes

  • To test the classic onion tart recipe, slip a knife blade into the center, and when it comes out clean, it is cooked.

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Nutrition

Calories: 345kcalCarbohydrates: 13gProtein: 8gFat: 30gSaturated Fat: 17gPolyunsaturated Fat: 2gMonounsaturated Fat: 9gTrans Fat: 0.3gCholesterol: 155mgSodium: 141mgPotassium: 203mgFiber: 2gSugar: 5gVitamin A: 1043IUVitamin C: 7mgCalcium: 143mgIron: 1mg
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