Light, gourmet, and meltingly tender, Courgette & Salmon Lasagne (Lasagnes de Courgettes et Saumon) is an elegant, low-carb French twist on classic baked pasta. By swapping heavy wheat noodles for delicate lengthwise zucchini ribbons, this dish creates a naturally gluten-free layered bake packed with fresh pan-seared salmon, fragrant garlic, zesty lemon, aromatic dill, and a velvety béchamel sauce under a golden, bubbly layer of shredded mozzarella.
Whether prepared for a wholesome family dinner or an effortless weekend gathering, this balanced meal delivers all the rich comfort of traditional Italian lasagna without the heaviness.
Recipe Overview
- Prep Time: 20 minutes
- Vegetable & Fish Pre-Cook Time: 15 minutes
- Final Baking Time: 15 to 20 minutes
- Resting Time: 5 minutes (essential for clean slicing)
- Total Time: ~45 to 50 minutes
- Yield: 4 generous servings
- Estimated Calories: ~360 kcal per serving
- Skill Level: 100% Beginner-friendly / Low-Carb Comfort
The Culinary Science: Avoiding a Watery Zucchini Lasagne
The most common issue when substituting pasta sheets with zucchini is excess liquid pooling at the bottom of the baking dish. Zucchini contains nearly 95% water, which releases rapidly when heated. This recipe completely solves that problem through a simple two-step moisture-control technique:
- Osmotic Degorging (Sweating): Salting the thinly sliced zucchini ribbons draws out surface water through osmosis before the squash ever touches heat.
- Pre-Cooking Evaporation: Roasting the zucchini ribbons in an air fryer or on a baking sheet at 180°C (350°F) for 10 minutes evaporates residual moisture and softens the vegetable fibers, allowing them to absorb the flavors of the creamy béchamel and seared salmon during the final bake without turning soggy.
- Sealing the Salmon Juices: Dicing and lightly searing the salmon with olive oil, garlic, lemon juice, and fresh dill locks in natural fish oils, ensuring tender flakes that do not overcook or dry out in the oven.
Equipment Checklist
- Standard rectangular baking dish (approx. 8×10-inch or 7×11-inch ceramic/glass gratin dish)
- Mandoline slicer or sharp chef’s knife and cutting board
- Air fryer or large rimmed baking sheet with parchment paper
- Medium non-stick frying pan or skillet
- Paper towels or clean kitchen cloth (for blotting zucchini)
- Spatula and measuring spoons
Detailed Ingredient Breakdown
- 2 Medium Courgettes (Zucchini): Fresh, firm zucchini sliced thin lengthwise into long ribbon sheets to act as pasta noodles.
- 300 g Fresh Salmon Fillet: Skinless, boneless fresh salmon cut into uniform bite-sized cubes.
- 200 ml Light Béchamel Sauce (Béchamel Légère): Store-bought or homemade light white sauce (made with skim milk, light butter, and flour/cornstarch) to bind the layers with creamy richness.
- 100 g Shredded Mozzarella Cheese: Melts into a stretchy, golden, bubbling gratin crust.
- 1 Clove Garlic (minced): Infuses the cooking oil and salmon with savory aroma.
- Juice of ½ Lemon: Cuts through the rich salmon fat with bright citrus acidity.
- 1 tbsp Extra Virgin Olive Oil: For gently sautéing the garlic and salmon cubes.
- Fresh Dill (optional, finely chopped): Adds a classic European herbal finish that pairs with salmon.
- Fine Salt & Freshly Ground Black Pepper: To taste.
Step-by-Step Instructions
1. Prepare and “Sweat” the Courgettes
Wash and trim the ends of the 2 medium courgettes.
Using a mandoline slicer or sharp chef’s knife, slice the courgettes lengthwise into uniform, thin ribbon planks (about 2–3 mm thick).
Arrange the ribbons flat on a clean kitchen towel or cutting board, sprinkle lightly with fine salt, and let them rest (dégorger) for 10 minutes to draw out excess water. Pat dry thoroughly with paper towels.
2. Pre-Cook the Courgette Ribbons
Arrange the zucchini slices in a single layer inside your Air Fryer basket (or flat on a parchment-lined baking sheet).
Cook at 180°C (350°F) for 10 minutes until the ribbons are pliable, lightly tender, and the surface moisture has evaporated. Set aside.
3. Sear and Season the Salmon
Cut the 300 g of fresh salmon into small, uniform bite-sized cubes.
Heat 1 tablespoon of olive oil in a non-stick frying pan over medium heat. Add the minced garlic clove and sauté for 30 seconds until fragrant (do not let it burn).
Add the diced salmon cubes to the skillet. Season with the juice of ½ lemon, freshly ground black pepper, a pinch of salt, and finely chopped fresh dill.
Sauté gently for 5 to 7 minutes, stirring carefully so the salmon cubes stay intact, just until lightly cooked through. Remove from heat.
4. Assemble the Lasagne Layers
Lightly grease your gratin baking dish. Assemble the dish in alternating layers:
- Spread a thin base layer of light béchamel sauce across the bottom of the dish.
- Cover with a layer of pre-cooked courgette ribbons, overlapping them slightly like pasta sheets.
- Scatter a generous portion of the sautéed salmon cubes over the courgettes.
- Drizzle lightly with more béchamel sauce.
- Repeat the layering process (courgette ribbons, salmon cubes, béchamel) until all ingredients are used up.
5. Add the Cheese Crust
Finish the final top layer with a generous spread of béchamel sauce.
Scatter the 100 g of shredded mozzarella cheese evenly across the entire surface from corner to corner.
6. Bake to a Golden Gratin
Preheat your oven to 180°C (350°F).
Place the assembled baking dish on the center rack and bake for 15 to 20 minutes.
- Doneness Cue: The lasagne is ready when the edges are bubbling vigorously and the cheese top is melted, blistered, and golden-brown.
7. Rest and Serve
Remove the dish from the oven and let it rest undisturbed for 5 minutes before cutting. (Resting allows the vegetable layers to settle and firm up slightly for clean, intact portions).
Pro Tips for Success
- Ultra-Light Low-Calorie Swap (Astuce Légère): To make this recipe even lighter and higher in protein, replace the 200 ml of béchamel with 200 g of 0% Fromage Blanc (or fat-free plain Greek yogurt) mixed with 1 teaspoon of mild French mustard, a pinch of nutmeg, salt, and pepper.
- Smoked Salmon Variation: Replace 100 g of the fresh salmon with thin strips of smoked salmon layered directly between the courgettes for a smoky flavor.
- Serving Suggestions (À Servir Avec): Serve warm alongside a crisp, zesty green salad with lemon vinaigrette or a light cucumber ribbon salad tossed with fresh dill and olive oil.
Storage and Reheating
- Refrigerator Storage: Store leftovers in an airtight container or covered tightly with foil in the refrigerator for up to 2 to 3 days.
- Reheating: Reheat in an oven at 160°C (320°F) for 10 to 12 minutes to restore the melty cheese crust without drying out the salmon. Microwave individual slices on medium power for 1 to 2 minutes.
- Freezing: Freezing is not recommended, as thawed cooked courgettes lose structural integrity and can become watery.