Italian Layered Vegetable Bake | Sformato di Verdure
Updated: 22 hours ago
Sformato di Verdure is eggplant, zucchini, potato and sweet pepper built in layers with smoked scamorza, Parmigiano Reggiano and breadcrumbs, baked until the top is brown and brittle and the inside holds together when you cut it. It is a contorno that eats like a main course, and the only difficult thing about it is water. Four vegetables go in carrying very different amounts of it, and the whole method is arranged around removing the excess before the dish sees the oven.
Done properly a slice stands on the plate with visible strata, the potato pale at the base, the eggplant dark in the middle, a thread of melted scamorza running between them. Done carelessly it slumps into a wet grey heap and the breadcrumbs on top turn to paste. The difference is salting the eggplant, parcooking the potato, and covering the dish for the first stage of baking rather than the last.
Yield: 6 side servings, or 4 as a light main. Prep: 45 minutes, plus 30 minutes salting. Cook: 1 hour 15 minutes. Rest: 20 minutes. Total: about 2 hours 50 minutes. Difficulty: intermediate. Course: contorno. Region: central and southern Italy.
The Story
The word sformato means unmoulded, and in the formal Italian repertoire it describes something quite specific: a vegetable puree bound with besciamella and egg, baked in a buttered mould and turned out whole. That dish arrived with the monsu, the French trained chefs who cooked for the Neapolitan and Piedmontese aristocracy, and it is a cousin of the French timbale. Artusi records several in 1891, made with cauliflower, spinach and fennel.
What most Italian households now call sformato di verdure is the other branch of the family, the one that never went through a court kitchen. It is a layered bake, closer to a tiella or a gratin than to a moulded custard, and it solves a domestic problem: at the end of summer there are more courgettes, aubergines and peppers than anyone can eat. Puglia has the tiella of potatoes, rice and mussels; Liguria has its vegetable torte; Sicily has caponata. This is the same instinct working without a recipe.
The smoked scamorza is the detail that places this particular version. Scamorza is a pasta filata cheese from Abruzzo, Molise and Puglia, tied at the neck and hung to dry, and the smoked one is cured briefly over straw or wood. It melts into threads rather than pools of grease, which is why it survives a long bake where fresh mozzarella would flood the dish, and its smoke does for a tray of vegetables what cured pork does in a meat kitchen. That choice is what keeps this from tasting like an ordinary gratin.
Ingredients
For the vegetables
Eggplant, medium, 1, about 12 oz (340 g)
Zucchini, medium, 1, about 7 oz (200 g)
Yellow fleshed potatoes, 2 medium, about 14 oz (400 g)
Red or yellow bell pepper, 1, about 5 oz (150 g)
Coarse sea salt, for drawing water from the eggplant, 1 tbsp (18 g)
Extra virgin olive oil, 6 tbsp (90 ml)
Fine sea salt and freshly ground black pepper, to taste
For the layers
Smoked scamorza, thinly sliced, 5 oz (150 g)
Parmigiano Reggiano, finely grated, 1/2 cup (45 g)
Dry breadcrumbs, plain and coarse, 1/2 cup (60 g)
For the topping
Dry breadcrumbs, 3 tbsp (25 g)
Parmigiano Reggiano, grated, 2 tbsp (12 g)
Extra virgin olive oil, 1 tbsp (15 ml)
Preparation
Salt and drain the eggplant
Cut the eggplant into rounds a quarter inch (6 mm) thick, lay them in a colander in overlapping layers and scatter the coarse salt between them. Sit the colander in the sink and leave it 30 minutes; beads of brown liquid will collect and run out of the base. Rinse off the salt, then press the slices firmly between towels until they stop giving anything up. This removes both bitterness and a surprising volume of water, and skipping it is the commonest reason the finished dish is soggy.
Parcook the potatoes
Peel the potatoes and slice them the same quarter inch (6 mm) thick. Drop the slices into boiling salted water for 5 minutes, just until a knife edge goes in with light resistance, then drain and spread them on a tray to steam dry. Potato cooks more slowly than the rest, and raw slices are still chalky when the eggplant above them has collapsed.
Slice the zucchini and pepper
Cut the zucchini lengthwise into ribbons a quarter inch (6 mm) thick rather than into rounds; the long pieces bridge the width of the dish and hold the structure together when you cut a portion. Core the pepper and cut it into flat panels, then shave off the pale inner ribs, which stay tough and watery. Lay both on paper and blot them. Zucchini is over 94 percent water and every drop you take now is one that does not end up in the base of the dish.
Set the oven and the dish
Heat the oven to 375°F (190°C) with a rack in the lower third. Brush a square baking dish, 9 inches across and 3 inches deep (23 by 8 cm), generously with oil, then dust the base with about 2 tablespoons of breadcrumbs and tilt it until they coat evenly. That crumb layer is not decoration: it absorbs the first liquid released during baking and stops the bottom layer sitting in it.
Build the layers
Start with the potatoes, overlapping them like roof tiles, then season with fine salt and pepper, drizzle with oil, and scatter over a little scamorza, Parmigiano and breadcrumbs. Repeat with the eggplant, then the zucchini, then the pepper, dressing each layer the same way. Keep the oil moderate on the eggplant, which soaks up whatever you give it, and the crumb thin, since too much turns pasty. Press down firmly with your palm before the last layer goes on.
Bake covered, then uncovered
Mix the topping breadcrumbs with the Parmigiano and the tablespoon of oil, scatter it over the surface, then cover the dish tightly with foil and bake 45 minutes. The foil traps steam and cooks the interior through without letting the top brown too early. Take the foil off and give it 25 to 30 minutes more, until the crumb is deep golden and the edges bubble. A thin knife should meet no resistance through the potato.
Rest before cutting
Take the dish out and leave it on a rack for at least 20 minutes before a knife goes near it. During baking the cheese is molten and the layers are held apart by steam; cut then and the slice slides apart and liquid runs across the plate. As it cools the scamorza sets just enough to glue the strata together and the crumb base reabsorbs what it released.
Plating
Cut with a thin bladed knife, wiping it between cuts, and lift each portion out with a wide offset spatula slid right down to the base of the dish so the potato layer comes up with everything above it. Square portions look better than wedges because the layers are the point and a straight cut face shows them. Serve on a warm plate rather than a hot one, since an overheated plate keeps the cheese molten and the slice slumps as it sits.
This is a contorno beside roast lamb, grilled fish or a simple chicken, and it needs no sauce or garnish. A thread of raw olive oil is the only addition I would make. It is equally at home at room temperature as part of an antipasto spread, which is how most Italian families eat it in August, cut into small squares on a board.
Professional Technique
The organising idea is staggered cooking rates. Potato, eggplant, zucchini and pepper need very different times and give up very different amounts of liquid, and stacking them raw in one dish guarantees that something is undercooked and something else has disintegrated. Parcooking the potato shortens its curve, salting the eggplant cuts its liquid release, and blotting the zucchini caps what it can contribute. By the time the dish goes in, four vegetables are on roughly the same schedule.
Covering first and uncovering second is the second technique, and it is the opposite of what the older version of this recipe told people to do. Foil for the first 45 minutes holds steam inside, which conducts heat into the centre far more efficiently than dry oven air and guarantees the potato is cooked through. Removing it for the last half hour lets the surface moisture evaporate so the crumb can brown. Bake uncovered throughout and you get a dark crust over a raw middle; bake covered throughout and the top never crisps at all.
The crumb functions as an engineered blotter at three levels. On the base it catches the first liquid and keeps the bottom slice out of a puddle. Between the layers, in thin scatterings, it absorbs what the vegetables release during baking and holds it in place instead of letting it run to the bottom. On top, bound with oil and cheese, it forms the brittle crust. Use fresh soft breadcrumbs anywhere in that system and all three functions fail, because soft crumb turns immediately to paste.
Texture and Moisture Control
Raw, these four vegetables carry well over a pint of water between them, and any of it left in the dish ends up in the base. The three preventive steps are the salting of the eggplant, the boiling and steam drying of the potato, and the blotting of the zucchini and pepper. None is optional, and together they are worth more than anything you can do once the dish is in the oven.
The cheese does structural work as well as flavour work. Smoked scamorza has a lower moisture content than fresh mozzarella and a pasta filata structure that melts into threads rather than breaking into oil and water, so it binds the layers instead of flooding them. Keep the slices thin and spread them out, since a thick seam of any cheese creates a slip plane the slice will shear along. The Parmigiano is there for salt and browning, and should be finely grated so it disappears into the crumb.
Professional Mise en Place
The whole dish can be assembled ahead and baked to order, which is how it works in a kitchen. The salting and the parcooking are the time consuming parts and both hold well.
Equipment and tools
Square baking dish, 9 inches across and 3 inches deep, ceramic or glass
Mandoline or a sharp knife for even quarter inch slices
Large colander that sits clear of the sink floor
Two trays lined with towels for draining and blotting
Wide offset spatula for lifting portions out
Prepared ahead
Eggplant salted, rinsed and pressed, up to 1 day ahead, refrigerated between towels
Potatoes parcooked and steam dried, up to 1 day ahead, covered and refrigerated
Scamorza sliced and Parmigiano grated, up to 2 days ahead, kept separately
The whole dish assembled unbaked, up to 12 hours ahead, covered and refrigerated
Service setup
Bring an assembled dish to room temperature for 30 minutes before it goes in the oven
Topping crumb mixed with oil and cheese at the last moment, never in advance
Foil cut to size and ready before the dish goes in
Plates warm rather than hot, and a clean knife plus a cloth at the pass
Chef Tips
Slice everything to the same quarter inch (6 mm). A mandoline is worth using here more than in almost any other home recipe, because uneven slices are what produce a dish that is simultaneously raw in one place and collapsed in another.
Choose a firm, glossy eggplant that feels heavy for its size and has a tight green calyx. Older ones are seedier and more bitter, and no amount of salting fully corrects that. If the seeds are brown rather than pale when you cut into it, the vegetable is past its best.
Use waxy or yellow fleshed potatoes rather than floury baking varieties. A floury potato falls apart during the parcooking and again in the oven, and the base layer that should hold the slice together turns to mash instead.
If you cannot find smoked scamorza, use plain scamorza or a young caciocavallo and accept that you have lost the smoke, which is the point of the dish. Low moisture mozzarella works at a pinch if you slice it thin and pat it dry first. Fresh mozzarella in water does not work at all.
Common Mistakes
Skipping the salting of the eggplant. Thirty minutes in coarse salt pulls out both bitterness and a considerable amount of water. Without it the eggplant releases everything inside the dish and the lower layers sit in liquid for the whole bake.
Layering the potatoes raw. Potato is far slower than the other three vegetables and stays chalky while the eggplant above it has already collapsed. Five minutes in boiling water brings it onto the same timetable as everything else.
Baking uncovered from the start. The crumb browns and then burns long before the centre is cooked. Cover for the first 45 minutes so steam carries heat into the middle, and uncover only for the final browning.
Using fresh soft breadcrumbs. Soft crumb absorbs liquid and turns to paste instead of staying granular, so it fails as a blotter between the layers and never crisps on top. Use dry, coarse crumb throughout.
Cutting it straight from the oven. Molten cheese and steam are holding the layers apart, so the slice slides sideways and liquid floods the plate. Twenty minutes on a rack lets the scamorza set and the crumb reabsorb what it released.
Wine Pairing
Fiano di Avellino DOCG: The most complete match here because it has the weight to meet the melted cheese without going flat. Fiano carries a waxy, almost hazelnut texture that runs with the Parmigiano and the toasted crumb, while its acidity stays high enough to cut the olive oil the eggplant has absorbed. A bottle with a year or two of age handles the smoke in the scamorza particularly well.
Falanghina del Sannio DOC: The brisker choice and the better one if you are serving the dish warm rather than at room temperature. Green apple and citrus acidity slices straight through the richness of a baked cheese layer, and the faintly bitter almond finish sits comfortably beside the eggplant. It has enough body to avoid being erased by the Parmigiano.
Etna Bianco DOC: Carricante grown on volcanic ash gives an intensely saline, high acid white with a struck flint quality that finds the smoke in the scamorza directly rather than working around it. The mineral finish also picks up the sweetness of the roasted pepper, which is the one flavour in the dish that can make a softer wine seem cloying.
Vermentino di Gallura DOCG: Grown on decomposed granite, it brings a saline bite and a bitter almond finish that deal well with the starch of the potato layer, which otherwise tends to flatten a wine. There is enough texture to carry the oil and enough freshness to reset the palate between mouthfuls of something rich and dense.
Cerasuolo di Vittoria DOCG: The red for the table that wants one, and the only kind that works on baked vegetables: frappato brings perfumed red cherry and almost no tannin, so nothing clashes with the eggplant. Serve it cool at around 57°F (14°C). At that temperature it behaves almost like a structured rosato and follows the sweetness of the pepper cleanly.
Storage & Reheating
Covered in the dish or moved to an airtight container, Sformato di Verdure keeps in the refrigerator for 3 days and is arguably better on the second, once the layers have compacted. Let it cool completely before covering, because trapping steam under foil while it is warm softens the crust immediately.
Reheat in a 350°F (175°C) oven, uncovered, for 15 to 20 minutes for individual portions or 25 to 30 for the whole dish. Uncovered is essential: the crumb needs dry heat to come back, and foil will steam it into paste. Avoid the microwave entirely, since it turns the crust soft and the cheese rubbery in about ninety seconds. Serving leftovers at room temperature is also perfectly correct.
It freezes reasonably well in portions, wrapped tightly and used within 2 months, though the potato loses some texture and the crumb never fully recovers. Thaw overnight in the refrigerator rather than at room temperature, then reheat uncovered as above with a fresh scattering of breadcrumbs and Parmigiano over the top to rebuild the crust.
Nutrition
Per serving, based on 6 side servings:
Calories: 345 kcal
Total Fat: 22 g
Saturated Fat: 7 g
Trans Fat: 0 g
Unsaturated Fat: 14 g
Cholesterol: 35 mg
Sodium: 520 mg
Total Carbohydrates: 24 g
Fiber: 4 g
Total Sugars: 5 g
Added Sugars: 0 g
Protein: 13 g
Lactose: 1 g
Principal micronutrients: calcium, phosphorus, potassium, vitamin C, vitamin A, folate
These figures are estimates. Most of the coarse salt used on the eggplant is rinsed away rather than eaten, and the fat figure moves with how heavily each layer is oiled.
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