Crostino al Tartufo

A small slice of toasted bread carries a thin smear of dark truffle paste, and the governing fact is how little of it is there. The crema is black truffle worked into a neutral fat, butter or mild oil, until it spreads smooth, sometimes with a few shavings of the fresh fungus laid over the top. The slice is eaten in a bite or two, warm, as an opening to a meal. Truffle is loud and fades fast on the palate, so the entire discipline of this crostino is to use the smallest quantity that still reads as truffle, on a base plain enough to let it through. There is one surface and one topping, and the skill is measuring the topping rather than piling it.

The base does real work precisely because there is only one of it, and most of the craft is heat. The bread is taken small and toasted dry so it stays rigid under the spread, since there is no second slice to brace against and a soft round goes limp the moment the warm crema goes on. Tuscan and Umbrian bread is classically unsalted, the pane sciocco that tastes flat alone, and that flatness is the point under a truffle: a salted, characterful loaf would argue with the fungus, where the bland crumb simply carries it. Black truffle aroma is volatile, so a crema pushed onto scorching toast or run under a grill flattens into almost nothing, the expensive part cooked off into the air; the toast is kept faintly warm, just enough to soften the butter and lift the smell. Spread the crema too thick and it tastes only of the oil it is suspended in, and fresh shavings go on at the very last moment, off the heat, since warming them past a point collapses the aroma.

The aroma arrives before the bite and carries most of the pleasure, that deep earthy garlic-and-forest-floor smell of black truffle rising off the warm toast. The crumb is crisp at the edge and gives in the middle where the warmth has softened it, and the crema is silky and faintly fatty, the truffle landing musky and savory and then receding quickly, the way it always does. A glass of an Umbrian red or a Vernaccia sits alongside. It is a small, rich, fleeting mouthful, gone before it is fully read, which is why they come two or three to a plate and rarely alone.

It belongs to a specific table, the antipasto board of central Italy in truffle season, set out in the trattorie and farmhouses of Umbria around Norcia and Spoleto and across the Tuscan hills, often as one tile in a mixed plate of crostini. In the producing towns the dish is domestic and seasonal rather than a luxury flourish, made when the local truffles are dug and folded into a butter that keeps a few days, and a kitchen there is as likely to use a jarred truffle crema put up in the autumn as a fresh-shaved tuber. It is poured for guests as the opener that announces the season.

The cousins are the rest of the crostino family, each defined by its single topping, and setting this one beside them shows what its restraint is for. The chicken-liver crostino of Tuscany, the crostino di fegato, carries a savory warm pate and is the region's everyday default; the tomato crostino runs fresh and cold; the lardo crostino lays cured pork fat to melt on warm bread. Against those, the truffle version is the most restrained and the most expensive, defined by holding back. A crostino is an open-face toast, a bread base under a topping with no lid, which places it among sandwiches as the single-surface member of the family rather than outside it.

The Norcia Truffle on Warm Bread

The crostino itself is vernacular Italian toast with no inventor and no origin date, and the documented history sits with the truffle it carries and the region that digs it. The prized truffle here is the Norcia black, Tuber melanosporum, formally described by the Italian mycologist Carlo Vittadini in his 1831 Monographia Tuberacearum, the foundational study of truffles. It is the winter variety, its season running roughly the first of December to the middle of March, dug in the limestone hills of southeastern Umbria around Norcia, Cascia, and the Valnerina, where it grows in symbiosis with oak and holm-oak. It is the precious one; the cheaper summer scorzone, Tuber aestivum, is the milder truffle a budget crema falls back on, and the two should not be confused.

That regional identity is a matter of record even where the toast is not. Norcia has built its food economy around the winter black truffle, and the town has run a national black-truffle exhibition and market, Nero Norcia, since the 1950s, held over the late-February weekends at the height of the season, one of Umbria's largest agricultural fairs. Truffle itself was prized far earlier, used as a flavoring in the ancient Roman and Greek kitchen, though those references describe the ingredient and not anything resembling this crostino.

In late February the stalls fill the colonnaded square in Norcia for the Nero Norcia market, the winter truffles weighed out under the noses of buyers while the season runs its course toward the March cutoff. On the trattoria tables around the square the same truffle is already on the bread, dug that week and worked into butter, set out two or three crostini to a plate as the warm opening mouthful before the meal, gone almost as fast as the aroma that announces it.