Lasagne Rivisitate ai Porri e Fontina (Italian Leek and Fontina Lasagne)

50 minutes ago
5 min read

Yield: 8 servings | Prep: 50 minutes | Cook: 50 minutes | Rest: 15 minutes | Total: about 1 hour 55 minutes

Story of the Dish

Leeks and Fontina create a deceptively simple northern Italian combination. Both ingredients have natural sweetness, so the dish needs controlled caramelization, acidity, and aged cheese to avoid becoming flat. These revisited lasagne use slowly cooked leeks, dry white wine, Fontina-enriched besciamella, fresh pasta, Parmigiano Reggiano, and thyme. The leeks are first softened gently and then given slightly higher heat to evaporate moisture and create pale golden edges. Most of the Fontina is melted into the completed besciamella so its flavor is spread evenly and its fat remains emulsified. A smaller amount is diced between the layers for occasional deeper cheese notes. Mozzarella is intentionally excluded because it adds water without improving the specific Fontina identity. The finished lasagna should show clear layers and a balance between sweet leeks, nutty cheese, creamy besciamella, and a crisp Parmigiano surface.

This recipe follows a layered Italian baking method in which every component is cooked to the correct point before assembly. Besciamella is not an optional garnish: it is the controlled source of moisture that allows the pasta to finish cooking evenly while binding the filling and cheese. The aim is a lasagna that is rich enough to feel generous but precise enough to cut into a clean portion after resting.

Ingredients

For the Leeks

3 lb leeks (1.36 kg)
2 tbsp extra virgin olive oil (30 ml)
3 tbsp unsalted butter (42 g)
1/2 cup dry white wine (120 ml)
3/4 tsp fine sea salt, or as needed
1/2 tsp freshly ground black pepper
1 tsp fresh thyme leaves (1 g)

For the Besciamella

5 tbsp unsalted butter (70 g)
1/2 cup all-purpose flour (65 g)
4 cups whole milk (950 ml)
1/2 tsp fine sea salt, or as needed
1/8 tsp white pepper
Freshly grated nutmeg, used lightly
7 oz Fontina DOP (200 g), rind removed and finely diced

For Assembly

1 lb fresh lasagna sheets (450 g)
4 oz Fontina DOP (115 g), rind removed and finely diced
1 1/4 cups finely grated Parmigiano Reggiano (110 g)
1 tbsp unsalted butter (14 g)

Preparation

1. Prepare the Main Ingredient

Remove the dark green tops and roots from the leeks, split them lengthwise, and wash carefully between every layer. Dry thoroughly, then slice crosswise about 1/4 inch (6 mm) thick.

2. Build the Flavor Base

Heat olive oil and butter over medium heat. Add the leeks, season lightly, and cook about 10 minutes until silky. Increase the heat slightly and cook another 5 to 7 minutes so some edges develop pale caramelization without becoming dark.

3. Prepare the Besciamella

Add the white wine and reduce until almost completely evaporated. Add thyme and black pepper, adjust salt, and cool the leeks. Prepare the besciamella and remove it from direct heat before gradually melting in 7 oz (200 g) Fontina. Keep the sauce smooth, glossy, and pourable.

4. Prepare the Pasta and Pan

Blanch pasta if required. Heat the oven to 375°F (190°C), butter a 9 x 13 inch (23 x 33 cm) dish, and spread a thin layer of Fontina besciamella on the base. Layer pasta, leeks, cheese besciamella, a few small pieces of reserved Fontina, and Parmigiano.

5. Assemble and Bake

Build 5 to 6 thin layers. Finish with pasta, Fontina besciamella, and Parmigiano. Bake covered for 25 minutes and uncovered for 15 to 20 minutes until deeply golden. Rest 15 minutes before cutting.

Professional Technique

Leeks contain more water than their soft texture suggests. The professional method therefore uses two heat stages: moderate heat first to soften the vegetable and slightly higher heat afterward to evaporate moisture and create restrained caramelization. White wine adds necessary acidity because both leeks and Fontina are naturally sweet, but the wine must reduce almost completely before assembly. Most of the Fontina is melted into the besciamella away from aggressive heat, where the sauce starch helps keep the cheese fat emulsified. Reserved Fontina pieces should remain small. Besciamella needs enough fluidity to hydrate the pasta because the cooked leeks are deliberately quite dry. Adding ricotta, mascarpone, cream, or mozzarella would make the dish richer but less precise.

A professional lasagna also depends on proportion. Pasta, filling, besciamella, and aged cheese should repeat in thin layers rather than forming separate heavy blocks. The besciamella must be fluid before baking because it thickens again in the oven, and the final surface should be designed for browning without leaving delicate ingredients exposed to dry heat. Resting for at least 15 minutes is essential: during that time the starches absorb free moisture and the dairy proteins stabilize, which is what makes a neat slice possible without drying the interior.

Chef Tips

Use only the white and tender pale-green leek portions.
Wash thoroughly between every layer.
Dry the leeks before slicing.
Cook slowly before allowing light caramelization.
Reduce white wine almost completely.
Use authentic Fontina DOP when possible.
Melt Fontina off aggressive direct heat.
Keep the besciamella fluid and rest before serving.

Common Mistakes

Poorly washing the leeks and leaving hidden soil.
Browning the leeks too aggressively.
Leaving unreduced wine in the filling.
Using too much Fontina and making the dish greasy.
Boiling the Fontina sauce.
Adding mozzarella and unnecessary moisture.

Wine Pairing

Roero Arneis DOCG

Orchard fruit, floral notes, acidity, and almond character give enough body for Fontina while respecting the leeks.

Gavi DOCG

Cortese offers crisp citrus and mineral freshness that cut through the cheese sauce.

Soave Classico DOC

Garganega's restrained fruit and almond finish pair naturally with cooked leeks and Parmigiano.

Franciacorta

Fine bubbles and acidity provide a clean contrast to Fontina and besciamella.

Valle d'Aosta Petite Arvine

A regional-minded choice with citrus, mineral tension, and enough acidity for Fontina and sweet leeks.

Storage & Reheating

Allow leftovers to cool promptly, then refrigerate in an airtight container for up to 3 days. Reheat individual portions in a 350°F (175°C) oven for approximately 15 to 20 minutes, covered loosely with foil. Remove the foil during the final 5 minutes so the gratinated surface can recover. Avoid unnecessarily high reheating temperatures, which can dry the pasta or cause cheese sauces to separate. The assembled unbaked lasagna can be refrigerated for up to 24 hours. It can also be frozen, tightly wrapped, for up to 2 months; for the best texture, thaw overnight in the refrigerator before baking.