French Zucchini Flan with Homemade Tomato Sauce

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Atsuko
zucchini flan tomato sauce zucchini onion garlic
Author Profile Image

Atsuko

Founder of @Umami Sans Frontières

French Zucchini Flan with Homemade Tomato Sauce is a light, fluffy, and savory vegetable custard that is a classic of French home cooking. This easy zucchini flan recipe is delicious served chilled, making it a perfect vegetarian appetizer, side dish, or light lunch for spring and summer.  Unlike the sweet custard dessert many people associate with flan, savory vegetable flans are also popular in France. Topped with a simple homemade tomato sauce, this zucchini flan becomes a fresh, flavorful dish that’s perfect for warm-weather meals. ☀️
Expense
💵
Preparation
20 mins
Baking time
40 mins
Rest Time
240 mins

Ingredients

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

Yield: 4-6 servings
Dish: 12 × 28 × 7.5 cm (4.7 × 11 × 3 in) Pyrex glass baking dish

For the Zucchini Flan

  • 600–800 g zucchini
  • 2 cloves garlic
  • ½ onion
  • Olive oil, as needed
  • 4 eggs
  • 200 ml heavy cream
  • 15–20 g fresh basil leaves (or parsley)

For the Homemade Tomato Sauce

  • 400 g tomato purée or canned tomatoes
  • 1 clove garlic
  • ½ onion
  • Fresh or dried herbs of your choice (such as basil or bay leaf)
  • Olive oil, as needed
  • Salt, to taste
  • Black pepper, to taste
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 10–15 minutes. Season with salt and pepper.

zucchini

3. Chop the Basil:

Finely chop the fresh basil leaves.

4. Make the Egg Mixture:

In a large bowl, whisk together the eggs, heavy 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 grease the inside of a baking dish with olive oil. Pour in the zucchini mixture.

zucchini flan in a baking dish

7. Bake the Flan:

Bake in a preheated oven at 180°C (350°F) for about 40 minutes, or until the flan is set and lightly golden.

baked zucchini flan

🍅 Homemade Tomato Sauce

8. Prepare the Ingredients for the Sauce:

While the flan is baking, finely chop the onion and garlic for the tomato sauce.

9. Sauté the Aromatics:

Heat olive oil in a saucepan. Add the garlic and onion, and sauté until fragrant.

garlic oniono

10. Simmer the Tomato Sauce:

Once the onion becomes translucent, add the tomato purée or canned tomatoes along with the basil (or your preferred herbs, such as bay leaf). Simmer gently over low heat for 30–40 minutes. Season with salt and pepper to taste.

tomato puree basil

11. Cool and Serve:

Remove the flan from the oven and let it cool slightly. It should be lightly golden on top and just set. Allow it to cool completely, then refrigerate until chilled.

Once cold, carefully unmold the zucchini flan by inverting it onto a serving plate or cutting board. Slice into portions and serve with the homemade tomato sauce on the side or spooned over the top.

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.

zucchini flan

 

Umami Sans Frontières – Copyrights 2026
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Written byAtsuko

Founder of @Umami Sans Frontières

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