Burgundy truffle:species, season and culinary use

In short: the Burgundy truffle is a precise species, Tuber uncinatum, distinct from the Périgord black truffle (Tuber melanosporum). It ripens under oaks and hazels, in limestone soil, from mid-September to January. In Côte-d’Or, harvesting is only legal from 15 September, and picking without the owner’s permission is a criminal offence, not a minor fine. The region produced 26 tonnes in 2021, of which 10 in Côte-d’Or.

Two truffles compete for French gastronomic fame: the black Périgord truffle, harvested in winter, and the Burgundy truffle, more discreet, which ripens in autumn under the same forests where porcini are picked. Mistaking it for a plain dark mushroom would be a mistake.

Tuber uncinatum, a species in its own right

Classification and distinction from the Périgord truffle

The Burgundy truffle belongs to the kingdom of fungi, the division Ascomycota, the order Pezizales and the family Tuberaceae, under the name Tuber uncinatum. Its epithet comes from the hook-shaped ornamentation covering its spores. It differs from Tuber melanosporum, the Périgord black truffle described in 1831 by Italian mycologist Carlo Vittadini, by its season (autumn versus winter) and its aroma, closer to hazelnut than to spiced undergrowth. France produces nearly two thirds of the world’s black truffle; the Burgundy truffle remains a far more confidential regional product.

Appearance and aroma

At maturity, it has a dark brown to black exterior, covered in hexagonal to pyramidal warts. Its flesh, chocolate brown, is streaked with a network of fine white veins, a marbling that distinguishes it from an immature truffle with pale flesh. Its aroma, more discreet than that of the winter black truffle, evokes hazelnut, with woody, musky and lightly fruity notes.

The ecology of an underground fungus

Symbiosis with trees

Tuber uncinatum is a mycorrhizal fungus: it lives in symbiosis with the roots of certain trees, exchanging sugars from photosynthesis for minerals drawn from the soil. Its main partners are the oak and the hazel, but also hornbeam, beech and, more rarely, pine, which explains its presence at woodland edges rather than in dense forest or open pasture.

Limestone soils and continental climate

The species grows in calcareous or clay-limestone soils, well-drained and slightly basic, terrain that Côte-d’Or offers in abundance on its hillsides. It remains sensitive to water: a too-dry spring and summer limit its growth and delay ripening. Rising temperatures weigh on recent harvests by reducing moisture in clay soils at the critical moment when truffles swell.

The season and its official date

From 15 September to January

Ripening runs from mid-September to January, with peak quality between November and December. In Côte-d’Or, the prefectural order of 12 September 2002 sets the legal harvest opening at 15 September: a truffle picked before that, with pale, unmarbled flesh, cannot be called a « truffe de Bourgogne ». The order also bans digging with a pickaxe; only searching with a dog or pig is authorised.

Cavage, a harvest policed like theft

Picking truffles without the landowner’s authorisation, whether a private individual, a municipality or the Office national des forêts for state forest, is punished under Article L163-11 of the Forest Code with the same penalties as theft, whatever the quantity. That is stricter than for other mushrooms, where only a harvest exceeding 10 litres draws a heavy sanction. This framework rests on the right of accession: the natural fruits of a plot belong to its owner, whether a sign says so or not.

The culinary use of the Burgundy truffle

The rule of infusion, not cooking

It is used whole, unpeeled: thinly sliced or grated straight onto the dish, at a rate of 10 to 20 g per person. It should not be cooked for long, its aroma spreads better through infusion.

The fat, 24 to 48 hours ahead

Sliced and placed in butter, cream or eggs, at under 60°C, it passes on its aroma without ever cooking.

Classic pairings

It goes with scrambled eggs, fresh pasta, poultry and some fish, added at the end of preparation. Once bought, it keeps a few days in the fridge in an airtight box, surrounded by raw rice that absorbs moisture.