Zucchini stuffed with tuna is a classic recipe from Mediterranean home cooking. They are light, nutritious, economical, and perfect for both family meals and weekly meal prep. Their balance of lean protein and vegetables makes them an ideal choice if you’re looking for a healthy meal without sacrificing flavor.
Below you will find a complete and professional guide to preparing this recipe step by step.
1️⃣ History and origin of the dish
Stuffed vegetables have been part of Mediterranean culinary tradition for centuries. In countries like Spain, Italy, and Greece, it’s common to stuff vegetables such as peppers, eggplants, and zucchini with mixtures of meat, rice, or fish.
Zucchini (also known as courgette) arrived in Europe from the Americas in the 16th century, but it was in Italy where it became widely popular. Over time, Spanish cuisine adopted this vegetable in numerous preparations, especially baked dishes.
The version with canned tuna is a practical and economical adaptation of the traditional meat filling. The tuna provides high-quality protein, intense flavor, and a smooth texture that combines perfectly with the zucchini pulp and the final gratinéed touch.
Today, this recipe is very popular in healthy cooking blogs and balanced diets because of its low calorie content and high nutritional value.
2️⃣ Full ingredients (with actual quantities)
Serves 4 (8 halves):
- 4 medium zucchini (approx. 1 kg)
- 3 cans of drained tuna in water (240g net weight)
- 1 medium onion (150 g)
- 1 clove of garlic
- 1 large ripe tomato (200 g) or 150 g of crushed tomatoes
- 50 ml of extra virgin olive oil
- 100g of grated cheese (mozzarella or gratin mix)
- 2 tablespoons of breadcrumbs (optional)
- Salt to taste
- Black pepper to taste
- 1 teaspoon of dried oregano
- Fresh chopped parsley
Optional:
- 1 chopped hard-boiled egg
- 30g of chopped green olives
3️⃣ Very detailed step-by-step preparation
Step 1: Prepare the zucchini
Wash the zucchini well and cut them in half lengthwise.
Using a small spoon, carefully empty the pulp, leaving approximately 1 cm of thickness at the edges to maintain structure.
Reserve the extracted pulp.
Place the halves on a baking tray and add a pinch of salt. You can pre-bake them for 10 minutes at 180°C to soften them slightly.
Step 2: Prepare the filling
Finely chop the onion and garlic.
In a large frying pan, add the olive oil and sauté the onion over medium heat for 5 minutes until translucent.
Add the chopped garlic and cook for 1 more minute.
Add the zucchini pulp, previously diced into small cubes. Cook for 5–7 minutes until it releases its water.
Add the chopped or crushed tomato and cook for 8 minutes until reduced.
Add the drained and flaked tuna. Mix well.
Season with salt, pepper, and oregano.
Cook for 3 more minutes to blend the flavors.
Remove from heat and add fresh parsley.
Step 3: Fill
Generously fill each zucchini half with the mixture.
Sprinkle grated cheese on top.
If you want a crispier texture, mix the cheese with breadcrumbs.
Step 4: Baking
Preheat the oven to 180°C.
Bake for 20–25 minutes until the cheese is golden brown and bubbly.
If you want a more intense gratin, turn on the grill for the last 3 minutes.
Step 5: Rest
Let it rest for 5 minutes before serving to allow the filling to settle.
4️⃣ Results and final presentation
The result is a dish:
✔ Juicy and balanced
✔ Creamy inside
✔ Light but satisfying
✔ With a golden gratinéed surface
You can serve them with:
- Fresh green salad
- Brown rice
- Steamed potatoes
- Toasted artisan bread
For professional presentations:
- Sprinkle with fresh parsley
- Add a thin stream of olive oil
- Serve on a white plate to highlight the colors
5️⃣ Possible substitutions or variations
Low-calorie version:
Use light cheese or omit the cheese and gratin only with whole wheat breadcrumbs.
Lactose-free version:
Use plant-based cheese or simply omit the gratin.
With béchamel sauce:
Add 150 ml of béchamel sauce to the filling for a creamier version.
With rice:
Add 100g of cooked rice to the filling to make it more substantial.
With meat:
Substitute the tuna with 300g of minced meat.
Keto version:
Remove the tomato and add more cheese and olive oil.
6️⃣ Storage and freezing tips
Under refrigeration:
- Store in an airtight container.
- They last 3 days in the refrigerator.
Freezing:
- They can be frozen after baking.
- Wrap individually.
- Duration: up to 2 months.
To reheat:
- Oven at 170°C for 15 minutes.
- Avoid microwave if you want to preserve texture.
7️⃣ Actual Nutrition Facts per Serving
(1 filled half – approximately 1/8 of the recipe)
| Nutrient | Amount |
|---|---|
| Calories | 180 kcal |
| Proteins | 15 g |
| Fats | 11 g |
| Carbohydrates | 6 g |
| Fiber | 2 g |
| Sodium | 320 mg |
Approximate values depending on the type of tuna and cheese used.
8️⃣ Frequently Asked Questions (FAQs)
Can they be made with tuna in oil?
Yes, but reduce the added oil to balance the fats.
Why are my zucchini soggy?
You didn’t drain the flesh well enough, or the tomato had too much water.
Can they be made in an air fryer?
Yes, at 180°C for 12–15 minutes.
Can I prepare them in advance?
Yes, you can leave them filled in the refrigerator up to 24 hours before baking.
Can they be made vegetarian?
Substitute the tuna with sautéed mushrooms or textured soy protein.
9️⃣ Chef’s Tips
⭐ Drain the tuna very well.
⭐ Don’t overcook the zucchini before stuffing.
⭐ Adding a pinch of nutmeg enhances the flavor.
⭐ For extra creaminess, mix 1 tablespoon of cream cheese into the filling.
⭐ Use firm, similar-sized zucchini for even cooking.