Jean Claude Authier and Max George carefully uncover a truffle they have found, Puget-Theniers, France, 09 February 2011. This plot of land is one of Jean Claude's 'truffle fields'. The land is watered and the ground kept cleared and aired to produce the optimum conditions for truffles, and young oak trees are planted in clearings. Generally, only certain trees in these fields produce truffles - season after season. The truffle hunters know exactly which ones.