French Zucchini Flan with Homemade Tomato Sauce

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Atsuko
French Zucchini Flan tomato sauce zucchini egg onion garlic knife basil
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Atsuko

Founder of @Umami Sans Frontières

When you hear the word flan, you might immediately picture a sweet custard dessert. But in France, savory flans made with seasonal vegetables are also popular 🥒. One delicious example is the French Zucchini Flan, known as “Flan de Courgettes” in French—a light and fluffy vegetable custard that’s perfect served chilled, especially during the warmer months. This refreshing zucchini flan pairs beautifully with a homemade tomato sauce 🍅, making it an ideal vegetarian appetizer, side dish, or light summer lunch ☀️.
Expense
💵
Preparation
20 mins
Baking time
40 mins
Rest Time
240 mins

Ingredients

Cooking time: Cooking time: 60 minutes *excluding cooling time
Ingredients:

For 4 to 6 people

For the Flan:

  • 600–800g of Zucchini
  • 2 cloves of Garlic
  • 1/2 of an Onion
  • An appropriate amount of Olive Oil
  • 4 of Eggs
  • 200ml of Fresh Cream
  • 15–20g of Basil Leaves (or of Parsley)

For the Tomato Sauce:

  • 400g of Tomato Purée or of Canned Tomatoes
  • 1 clove of Garlic
  • 1/2 of an Onion
  • An appropriate amount of your favorite Herbs, such as of Basil Leaves or of Bay Leaf (dried is also fine)
How to make it:

1/ Prepare the Vegetables: Peel the zucchini and cut it into small cubes. Finely chop the onion and garlic.

2/ Sauté the Zucchini Mixture: Heat olive oil in a frying pan. Add the garlic, onion, and zucchini, and sauté over medium heat for about 10 to 15 minutes. Season with salt and pepper.

3/ Chop the Basil: Finely chop the fresh basil leaves.

4/ Make the Egg Mixture: In a large bowl, whisk together the eggs, cream, chopped basil, salt, and pepper.
5/ Combine and Mix: Add the sautéed zucchini mixture to the egg mixture and stir gently until well combined.


6/ Prepare the Baking Dish: Lightly coat the inside of a heatproof dish with olive oil. Pour in the zucchini mixture.
7/ Bake the Flan: Place the dish in an oven preheated to 180°C (350°F) and bake for about 40 minutes, or until set and golden.

🍅 Homemade Tomato Sauce

8/ Chop Ingredients for the Sauce: While the flan is baking, finely chop the onion and garlic for the sauce.

9/ Sauté the Aromatics: Heat olive oil in a saucepan. Add the chopped garlic and onion, and sauté until fragrant.
10/ Simmer the Tomato Sauce: Once the onions become translucent, add the canned tomatoes and basil (or your preferred herbs such as bay leaf). Simmer gently over low heat for 30 to 40 minutes. Adjust the seasoning with salt and pepper to taste.
11/ Cool and Plate the Flan: Once the flan is baked, remove it from the oven and let it cool slightly. At this stage, it should be golden on top and gently set in the dish—still warm and fragrant from the oven. Let it cool completely, then refrigerate until chilled.
Once cold, carefully remove the zucchini flan from the mold by flipping it out onto a plate or cutting board. Cut into portions and serve with the tomato sauce on the side, or spoon it over the top.

French Zucchini Flan tomato sauce

🌟Enjoy It Your Way: Tips and Stories🌟

⭐️ Make Ahead for Best Flavor: If you’d like to serve the flan cold, we recommend making it a day in advance. Chilling it overnight helps the flavors blend beautifully and gives the flan a firmer, smoother texture.

⭐️ Perfect for Light Meals or Side Dishes: This zucchini flan has a light and refreshing taste. It’s perfect as a vegetarian main course for lunch, served with a simple salad 🥗. You can also enjoy it as a side dish with meat or fish.

⭐️ Basil Substitute Tip: No fresh basil? No problem! You can substitute it with chopped parsley for a different but equally fresh and herbaceous flavor 🌿.

🌿 A Personal Note from Berlin

I first discovered this zucchini flan thanks to a French mom—my child’s friend’s mother—who brought it along as part of a picnic by a lake in Berlin one summer ☀️. She had made it the day before, served it cold at the beach, and I remember thinking, “How elegant!” It felt so effortlessly chic, especially for a simple packed lunch.
Perhaps this is something quite normal for the French… but for me, it was a little culinary inspiration 😅. Since then, this flan has become a summer favorite in our family—especially loved by my elder daughter. On hot days, it’s the kind of light and satisfying dish we always come back to.

French Zucchini Flan

 

Umami Sans Frontières – Copyrights 2025
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Written byAtsuko

Founder of @Umami Sans Frontières

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