Peperone Crusco

A crusco is the last stage of a three-part process. First the fresh pepper: Peperone di Senise IGP, a Lucanian variety with thin flesh and unusually little water. Then sun-drying, which turns it dark red, leathery and almost weightless. Then a flash fry, two or three seconds in hot olive oil, which makes it brittle as glass. Crusco means crisp in the local dialect.

The thing everyone gets wrong first is heat. There is none. This is a sweet pepper with essentially no capsaicin, and the flavour is toasted, sweet and faintly bitter, somewhere between sun-dried tomato and chestnut skin. Comparing it to paprika is natural and misleading: paprika is a powder, a crusco is a whole vegetable you bite.

The protected specification recognises three shapes of the fresh pepper (pointed, blunt and hooked) which differ in form rather than flavour. Peperone di Senise has held IGP status since 1996, and the crusco is its traditional transformation.

Ground versions are sold as 'polvere di peperone crusco'. Useful, aromatic, and beside the point: the texture is the reason the thing exists.

Sweet first, then toasted, then a light bitterness at the finish, the kind that makes you reach for another one. There is a distinct sun-dried-tomato character underneath, and a nuttiness that people often place as chestnut or roasted hazelnut skin.

The texture is the whole event. A properly fried crusco is airy and glassy and shatters against the teeth with almost no resistance, closer to a vegetable crisp than to anything leathery. It dissolves rather than chews.

Salt is added the second it leaves the oil, while the surface is still slick, so the first taste is salt and toasted pepper together. If it tastes bitter and dark rather than sweet, the oil was too hot: burnt crusco is a distinct and unpleasant flavour, and it happens in the space of a second.

Start dry. Remove the stem and shake out the seeds, and make sure the pepper snaps rather than bends: if it bends, it holds moisture and will go soft in the pan. Fifteen minutes in an oven at 50-60 °C / 120-140 °F fixes that.

Heat extra virgin olive oil to 160-170 °C / 320-340 °F. Drop in two or three peppers, count to three out loud, lift them out. Drain on paper and salt immediately, while the surface is still oiled. Too hot and they go black and bitter in the space of a breath; too cool and they soak up oil and stay limp.

Keep the frying oil. Strained, it is red, fragrant and excellent on beans and greens.

The canonical dish is baccalà: rehydrated salt cod cooked in oil with garlic and cherry tomatoes, with cruschi added at the end, whole or broken. The other is pasta with fried breadcrumbs, mollica, and crumbled cruschi over the top.

The timing rule governs everything: add them off the heat, at the last second. A minute in a simmering sauce turns a crusco into a limp skin.

Dryness is the whole business. Whole dried peppers hang on their strings in an airy place away from steam, or sit in a sealed jar or their vacuum bag, and any moisture in the room works against them: they lose the snap first, going supple and bendy, and a pepper in that state will not crisp in the pan. Packs carry a date from the producer. Over months the colour drifts from bright red toward dull brown as the pigments oxidise and the sweet dusty smell flattens, faster in daylight and in a warm kitchen, so a dark cupboard beats a hook by the cooker. Some households keep the strings in the freezer through a humid summer.

Once fried, the crusco has a short window. Cooled completely and then shut in an airtight jar it holds its shatter for a few days; left out on a plate it draws moisture from the air and goes limp overnight. Two or three minutes in a warm oven drives that moisture back out. Ground crusco keeps in a small airtight jar away from light, where it fades and loses aroma before anything else changes.

The pepper to look for is Peperone di Senise IGP, sold dried whole with the stalk still attached, often threaded into long strings called serte. It should be a deep brick red, almost weightless in the hand, with walls so thin they are translucent against a light, and it snaps rather than bends. Crucially it is a sweet pepper and not a hot one: the flesh has no burn at all, which is the whole point of eating a handful of them like crisps. Ready-fried crusco is also sold in vacuum bags and in a coarse powder.

This is where shopping abroad goes wrong, because the dried peppers on offer elsewhere are built for different jobs. Mexican ancho and guajillo are thick, leathery and meant to be rehydrated. Spanish nora and choricero are round and pulpy, scraped for paste. Kashmiri and Calabrian chillies carry heat. None of them will flash-fry to a brittle shell in a few seconds the way a Senise pepper does. IGP strings cost several times a bag of generic dried chillies.

Outside Italy this is an online purchase. US and UK importers of Southern Italian food carry dried Senise peppers at roughly 20 to 35 dollars or pounds for a bag, and jarred pre-fried ones at similar prices for far less product. Eataly and specialist Italian grocers stock them intermittently.

Buy them dried and whole rather than fried in jars. The frying takes three seconds and is the difference between the real thing and a soft approximation.

In Italy, dried whole peppers cost 25 to 45 euros a kilo, a figure that sounds alarming and is not, because they weigh almost nothing. A 100 g bag at 5 to 7 euros holds around twenty peppers, or four to five servings.

What to check: deep glossy red with no black patches or white bloom, stems intact, and a body that shatters when you press it. Look for the Peperone di Senise IGP mark if you want to know the raw material came from Basilicata: plenty of good cruschi are made from peppers grown elsewhere, and only the label will tell you.

Senise, in the province of Potenza, in August. The town's pepper festival coincides with the stringing season, when the balconies along the Sinni valley are hung with two-metre garlands of drying peppers and the whole valley changes colour. It is also when you can buy direct from growers.

The surrounding villages (Chiaromonte, Francavilla in Sinni, Valsinni, Noepoli) serve salt cod with cruschi year-round, and at Christmas the whole valley eats little else.

Matera has turned the crusco into a restaurant garnish, crumbled over everything. It is good, but to understand the product, eat it in its poor form in a village trattoria: pasta, fried breadcrumbs, crumbled peppers, nothing else.

Village festivals across Basilicata through the summer fry them to order, which is the only way to taste one at its best: a crusco has a working life of about two hours. While you are in Senise, the Monte Cotugno dam is worth the short detour: it reshaped this whole valley.