Italian Zucchini Lasagne | Lasagne Rivisitate di Zucchine
Updated: Oct 24
A lasagne without meat and without tomato is not a compromise in Italy, it is a separate tradition with its own rules. This one is built on zucchini cooked until sweet and lightly coloured, layered with egg pasta and a besciamella carrying a great deal of Parmigiano Reggiano. With no ragu underneath doing the structural work, the vegetable and the sauce have to hold the dish together on their own.
The difficulty is water. A zucchini is around ninety four percent water, and raw slices layered straight into a baking dish release all of it during the bake. The answer here has two stages: salt the slices and let gravity draw the moisture out, then cook them hard and fast in small batches so what remains evaporates and the sugars colour. Only then is the zucchini a layer rather than a leak.
The besciamella is deliberately looser than the one used for a meat lasagne. With no ragu contributing liquid, a stiff sauce bakes into something closer to a gratin and the corners stay dry. A sauce that pours slowly from the ladle finishes creamy, and that difference of a few tablespoons of milk is the adjustment most cooks miss.
Yield: 8 servings. Prep: 45 minutes. Cook: 50 minutes. Rest: 20 minutes. Total: about 1 hour 55 minutes. Difficulty: intermediate. Course: primo piatto. Season: high summer, when zucchini is firm and cheap.
The Story
Lasagne as Italians know it belongs to Emilia, where egg pasta is layered with ragu bolognese and besciamella and baked until the top blisters. That version is codified and defended. What is less often said abroad is that layered baked pasta existed long before the ragu did, and that across the centre and south it was always made with whatever the season offered: artichokes in spring, aubergines through the Campanian summer, zucchini in July and August when every garden produces more than a family can eat.
Zucchini itself is a late arrival that behaves like a native. The squash family crossed from the Americas in the sixteenth century, but the small immature squash picked young, which is what zucchina means, was developed in Italy, most likely around Milan. It spread south quickly because it grows fast, tolerates heat and can be picked every second day. By the nineteenth century it was everywhere in Ligurian and Campanian cooking, fried, stuffed, preserved in oil, or folded into baked pasta.
This treatment, with no tomato and Parmigiano carrying the savour, sits closest to the white baked pastas of Emilia while using a southern vegetable. Italian home cooking has always borrowed technique from one region and produce from another, and a summer lasagne of zucchini and besciamella is served today from Bologna to Naples without anyone claiming it for a single town.
Ingredients
For the zucchini
Medium firm zucchini, 2 3/4 lb (1.25 kg)
Fine sea salt, for drawing out water, 2 tsp (12 g)
Extra virgin olive oil, 4 tbsp (60 ml)
Garlic cloves, lightly crushed, 2
Fresh basil leaves, 8
Freshly ground black pepper, to taste
For the besciamella
Whole milk, 4 cups (950 ml)
Unsalted butter, 5 tbsp (70 g)
All purpose flour, 1/2 cup (60 g)
Bay leaf, 1
Freshly grated nutmeg, 1/8 tsp
Fine sea salt, 1 tsp (6 g)
Freshly ground white pepper, to taste
For assembly
Dried egg lasagne sheets, 12 oz (340 g), about 12 sheets
Parmigiano Reggiano, finely grated, 5 oz (140 g)
Coarse sea salt for the pasta water, 2 tbsp (30 g)
Unsalted butter for the dish, 1 tbsp (14 g)
For finishing
Parmigiano Reggiano, finely grated, 1 oz (30 g)
Extra virgin olive oil, 1 tbsp (15 ml)
Fresh basil leaves, small, 10
Freshly ground black pepper, to taste
Preparation
Slicing and salting the zucchini
Trim the zucchini and cut them lengthwise into planks a scant 1/4 inch (5 mm) thick, using a mandoline so the thickness is even. Layer the planks in a colander, salting each layer lightly with the 2 teaspoons of fine sea salt, and leave them over a bowl for 30 minutes. A surprising amount of water collects. Rinse the slices quickly under cold water to remove surface salt, then press them firmly between clean kitchen towels until they feel dry to the hand.
Sauteing the zucchini in batches
Heat 1 tablespoon of the olive oil in a wide pan over medium high heat with one crushed garlic clove. Add a single uncrowded layer of zucchini and cook about 2 minutes a side, until the edges turn golden and the slices lose their squeak. Lift them onto a tray, discard the garlic when it darkens, and repeat with fresh oil for each batch. Crowded slices steam, stay grey and watery, and no amount of oven time recovers them. Tear the basil over the hot slices and grind on black pepper.
Cooking the besciamella
Warm the milk with the bay leaf until it steams, then take it off the heat. In a heavy pan melt the butter, add the flour all at once and stir over low heat for a full 3 minutes, until the roux smells faintly of biscuit rather than raw flour. Remove the bay leaf and pour in the hot milk in three additions, whisking each smooth before the next. Return to low heat and cook 8 minutes, stirring constantly, until it coats a spoon but still falls from it in a ribbon. Season with salt, nutmeg and white pepper.
Boiling the pasta sheets to a firm al dente
Bring 6 quarts (5.7 litres) of water to a rolling boil and add the coarse salt only once it boils, which keeps the salt from pitting the pan and lets you judge the seasoning honestly. The water should taste clearly salty. Slide in three or four sheets at a time and boil them 2 minutes only, half the time on the packet. They must come out underdone and chalky at the centre, since they finish cooking in the oven on milk from the besciamella. Lift them into cold water, then lay them flat on damp towels.
Layering the lasagne
Butter a dish of about 9 by 13 inches (23 by 33 cm) and spread two ladles of besciamella across the bottom so the first sheets never touch bare metal. Build five layers in this order: pasta, a thin veil of besciamella, a close layer of zucchini, a generous dusting of Parmigiano. Keep the sauce thin at every stage and save enough for a proper covering on top. Finish with pasta, the remaining besciamella spread to the corners, the last Parmigiano and the olive oil.
Baking covered and then open
Heat the oven to 375°F (190°C). Cover the dish with foil, tenting it so it does not touch the cheese, and bake 30 minutes. The trapped steam is what finishes the pasta. Remove the foil and bake a further 15 to 20 minutes, until the surface is deep gold in patches and the sauce bubbles visibly at the edges. If the top is pale but the edges are ready, give it 2 minutes under the grill without leaving the oven.
Resting before cutting
Leave the dish on a rack for a full 20 minutes before a knife goes near it. Cut too early and the besciamella is still fluid, the layers slide and every portion arrives as a heap. Twenty minutes lets the starch set enough to hold a square edge while the lasagne is still hot. Cut to the base of the dish with a thin sharp knife and lift with a wide offset spatula.
Plating
Serve on warm plates, not hot ones. A plate straight from the warming drawer keeps the besciamella moving and the portion loses its edges within a minute. Around 120°F (50°C) is right: warm enough that the cheese stays glossy, cool enough that the square holds.
Place the portion slightly off centre, with the cut face turned towards the diner so the layers are legible. A summer lasagne is judged on the layers being visible, since there is no dark ragu to read: five clean bands of pale pasta, white sauce and green zucchini are the point. Spoon any sauce that escaped around the base, never over the top, where it would hide the crust.
Finish with two small basil leaves, a light grating of Parmigiano and one turn of black pepper. Nothing else. No oil at the table, no balsamic, no cream. The dish already has all the fat it can carry.
Professional Technique
The governing technique is water removal in two stages, and they are not interchangeable. Salting works by osmosis: salt on the surface pulls free water out of the zucchini cells over 30 minutes without heat, seasoning the vegetable from within and firming it. Sauteing works by evaporation and browning: high heat drives off the water salting could not reach and pushes the sugars towards caramelisation. Do only the first and the slices are bland. Do only the second and the pan floods and the zucchini stews.
The second technique is the deliberate undercooking of the pasta. Dried egg sheets are engineered to absorb liquid, and in a baked dish they behave like a sponge that has to be fed. Boiled to a true al dente and then given 45 minutes in the oven they come out soft with no bite left, which is why they leave the water chalky at the core. What they lose in the pot they take back from the besciamella, and that absorbed milk is what makes the layers taste of the sauce rather than sit beside it.
The third is the roux. Three minutes of cooking flour in butter partly gelatinises the starch granules and coats them in fat, so the hot milk hydrates them evenly instead of leaving lumps, and it drives off the raw cereal flavour that would otherwise sit under every mouthful.
Texture and Moisture Control
The whole dish is a moisture calculation. Cooked zucchini still holds water after salting and sauteing, the besciamella brings nearly a quart of milk, and the pasta arrives thirsty. The aim is for the pasta to take up exactly the surplus: too little sauce and the top sheets go leathery, too much and the portion slumps. The check when layering is that each veil of besciamella should just disappear under the zucchini rather than pool around it.
Starch binds everything, and it comes from two places. The flour gelatinises in the pan and again in the oven, and the pasta releases surface starch as it hydrates. That combined network sets during the rest and lets a portion stand up. It is also why cream is not used: cream has fat but almost no starch, so a besciamella loosened with it tastes richer and holds nothing together.
The cover and uncover sequence controls the rest. Under foil the dish is a sealed steamer, the temperature climbs evenly and the pasta finishes in captured vapour. With the foil off, the top loses water fast, the milk proteins and the Parmigiano brown, and a thin firm skin forms that keeps the portion from collapsing when cut.
Professional Mise en Place
This is a dish of long preparation and short assembly. Everything up to the layering can be done well ahead, and a lasagne built cold and baked to order beats one held hot in a cabinet.
Equipment and tools
Mandoline, or a steady hand and a sharp knife
Large colander over a bowl, and plenty of clean kitchen towels
Wide heavy saute pan, ideally two
Heavy saucepan and a balloon whisk
Baking dish about 9 by 13 inches (23 by 33 cm), and foil
Prepared ahead
Zucchini salted, dried, sauteed and cooled, up to 1 day, refrigerated
Besciamella cooked and cooled under a film of milk, up to 2 days
Parmigiano grated, in a sealed box, up to 2 days
Pasta sheets parboiled between damp towels, up to 4 hours, refrigerated
The whole lasagne assembled raw and refrigerated, up to 1 day
Service setup
A cold assembled lasagne stands at room temperature 45 minutes before baking
Add 10 minutes to the covered stage if it goes in cold
Rest 20 minutes out of the oven, timed, never guessed
Plates warm at around 120°F (50°C), basil and Parmigiano within reach
A thin knife and a wide offset spatula at the pass
Chef Tips
Buy small firm zucchini rather than large ones. A big late season zucchini has a spongy seeded core, more water and less flavour, and the slices break up in the pan. Anything longer than 8 inches (20 cm) is better kept for soup.
Taste the zucchini after you rinse off the salt. If the slices are bland you will be tempted to over season the besciamella to compensate, which throws the whole dish. Correct it in the pan instead, with a pinch as each batch cooks.
Grate the Parmigiano yourself and grate it fine. Pre grated cheese is dried out and often carries anticaking starch, which turns grainy in a besciamella. A microplane gives a powder that disappears into the sauce rather than sitting on it.
If the besciamella tightens while you assemble, and it will, whisk in warm milk a spoonful at a time until it flows from the ladle again. A sauce spread with a spatula tears the parboiled sheets and leaves bare patches that bake hard.
Common Mistakes
Layering raw zucchini straight into the dish. It releases every drop of its water into the bake and the bottom layer sits in a pool. Salt, dry and saute first, even when the zucchini looks firm.
Crowding the saute pan. Too many slices drop the pan below browning range, so the zucchini boils in its own liquid and comes out grey and limp. Cook in single layers and accept four batches.
Boiling the sheets to al dente. Pasta properly cooked in the pot is soft and formless after 45 minutes in the oven. Two minutes only, chalky at the core, and let the besciamella finish the job.
Making the besciamella too thick. With no ragu adding liquid, a stiff sauce bakes into paste and leaves the corners dry. It should fall from the ladle in a ribbon, not sit on it in a mound.
Cutting before the rest is over. The starch has not set, the layers slide and the portion arrives as a heap. Twenty minutes on a rack is not optional, and the lasagne stays hot.
Adding mozzarella to make it richer. It releases whey as it bakes, undoing the water control the method is built on. Parmigiano supplies all the savour needed here.
Wine Pairing
Soave Superiore DOCG: The most natural match on the list. Garganega from the volcanic slopes above Soave gives quiet stone fruit, a saline centre and a bitter almond finish, and that almond note lines up with the browned Parmigiano crust. Its acidity is moderate rather than sharp, so it lifts the besciamella without cutting against the sweetness of the cooked zucchini.
Verdicchio dei Castelli di Jesi Classico Riserva DOCG: Where the Soave soothes, the Verdicchio scrubs. A Riserva carries real weight and a waxy texture from its time on the lees, but keeps the high firm acidity the grape is known for, which is what stops a dish this creamy turning heavy by the third mouthful. Its citrus peel edge also picks up the basil.
Fiano di Avellino DOCG: The choice when you want the wine to match the richness rather than fight it. Fiano is broad and slightly waxy with hazelnut and pear, and that nuttiness sits beside a long cooked milk sauce and aged cheese. It has the structure to carry a full portion of baked pasta, which lighter whites do not.
Lugana DOC: Grown on heavy clay at the southern tip of Lake Garda, Lugana has a soft attack with a mineral spine running through it. That suits a dish with no acid component of its own: there is no tomato here for the wine to answer, so a bottle that flatters rather than confronts is the safer road.
Franciacorta DOCG: If the lasagne opens a meal rather than closing it, the traditional method sparkling of Lombardy is the classic answer. Fine persistent bubbles and a bready autolytic character clear the fat between forkfuls, and the dosage on a Brut is low enough that nothing tastes sweet against the zucchini. Serve at 48°F (9°C).
Storage & Reheating
Cooked lasagne keeps refrigerated for 3 days. Cool it uncovered for no more than an hour, then cover the dish tightly or move portions into airtight containers. It cuts more cleanly on the second day.
Reheat portions in a 325°F (165°C) oven, covered with foil, for 20 to 25 minutes, adding a spoonful of milk to the dish to replace what evaporated. A microwave works at medium power in an emergency, but it heats the sauce faster than the pasta and the layers separate. Never reheat in a pan over direct heat.
For the freezer, assemble the lasagne and freeze it raw rather than cooked. Raw it keeps 2 months, wrapped in film and then foil, and bakes from frozen at 350°F (175°C) for about 75 minutes covered plus 20 uncovered. Frozen cooked lasagne is edible, but the zucchini turns watery and the besciamella can separate.
Nutrition
Per serving, based on 8 portions:
Calories: 430 kcal
Total Fat: 22 g
Saturated Fat: 11 g
Trans Fat: 0.4 g
Unsaturated Fat: 10 g
Cholesterol: 55 mg
Sodium: 620 mg
Total Carbohydrates: 40 g
Fiber: 3 g
Total Sugars: 9 g
Added Sugars: 0 g
Protein: 19 g
Lactose: 5 g
Principal micronutrients: calcium, phosphorus, vitamin A, vitamin C, potassium, folate, vitamin B12
These figures are estimates. Most of the salt used to draw water from the zucchini is rinsed away and the pasta water is discarded, so the real sodium is lower than the ingredient list suggests.
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