Norcia, Perugia province, Umbria — the Valnerina valley and the surrounding Sibillini mountains are the heartland of Italian black truffle production. The truffle market at Norcia operates from November through March; the town's truffle tradition is documented from the medieval period.
Norcia (Perugia province) and the surrounding Valnerina are the global centre of production for Tuber melanosporum — the Périgord black truffle. Umbria's truffle culture is distinct from Piedmont's (which focuses on the white truffle, Tuber magnatum): the black truffle is more widely available, more versatile in cooking, and tolerates heat better than the white — it can be cooked, not merely warmed. The Norcino truffle technique involves grating or slicing the raw truffle into butter, olive oil, or pasta at the last moment of cooking, or making truffle-based products (pasta al tartufo, omelette al tartufo, bruschetta al tartufo) that rely on brief, controlled heat to open the volatile aromatic compounds without destroying them.
Black truffle at its best smells of earth, iron, and something almost animal — not dirty, but deeply mineral and alive. The flavour is similar but more attenuated than the aroma; the primary experience is olfactory. On warm, buttered pasta, the truffle's aroma rises into the steam — the smell and the flavour of the first bite are one of the most immediate, unmistakeable sensory experiences in cooking.
Black truffle perfume is in its volatile aromatic compounds (dimethyl sulfide and related thiols). These compounds are released by heat but destroyed by sustained high heat — the correct technique is brief warming, not cooking. Grate the truffle directly over warm pasta (not hot, boiling pasta — the temperature gradient matters), or melt it into warm butter for 30 seconds, or shave it over a warm omelette immediately before service. For truffle butter: blend grated raw truffle (5g per 100g butter) with soft, unsalted butter and a pinch of salt. Rest 24 hours in the refrigerator — the volatile compounds infuse the fat. Truffle pasta: grate fresh truffle directly over buttered fresh pasta and toss gently.
The best vehicle for black truffle is fat — butter or a neutral good olive oil, which absorbs the volatile aromatics and distributes them evenly. Eggs are the second-best vehicle: the fat in the yolk carries the truffle aroma, which is why omelette and scrambled eggs with truffle is one of the classic preparations. Store fresh truffles in a sealed glass container with eggs — the truffle aroma penetrates the eggshell and perfumes the eggs over 24-48 hours, making truffle omelette possible even from a small amount of truffle.
Cooking the truffle at high heat — the volatile aromatics evaporate quickly above 60°C. Using truffles from the wrong season — Tuber melanosporum is correctly harvested in winter (December-March); summer truffles (Tuber aestivum) have a completely different flavour character. Using truffle oil as a substitute — virtually all commercial truffle oil is flavoured with synthetic 2,4-dithiapentane, which approximates only one aromatic compound of the truffle; real truffle has 80+ aromatic compounds. Overusing truffle — its flavour is powerful; restraint produces a more elegant result.
Giorgio Locatelli, Made in Italy; Slow Food Editore, Umbria in Cucina