Tuber Mesentericum, or the Mésentérique truffle, has often been disdained because of its overpowering aroma and its particularly intense taste. The perfume of humus is tinged with a hint of liquorice. It's principally found in eastern France, Italy and Switzerland in sloping calcareous soil. Mostly collected wild in the Lorraine, there's little farming of this variety. Its shape is rather irregular, skin black and flesh a chestnut-chocolate colour marbled with white. Gathered end-September to end-December. Culinary advantage: the Mésentérique truffle can be cooked at low temperatures.