There is a traditional French truffled chicken dish called Poularde en demi-deuil, or chicken in half-mourning, in which a chicken has slices of black truffle inserted under its skin. You then leave the chicken for a few hours to infuse with the truffle flavour, and then poach it in a stock. When it comes out, the black slices shine through the white skin. There is a picture of a chicken roasted in half mourning in The Truffle Book...
In the Spanish Pyrenees, however, a few hours infusing is not enough. This thread on eGullet (wonderful name!) describes - with graphic and sometimes beautiful pictures - the preparation of a traditional Christmas dish. Chickens are stuffed (with foie gras, milk, breadcrumbs and black truffle) then wrapped in linen and buried in the ground for up to two weeks. The precise time depends on how cold the ground is - at that time of year it's close to freezing, which it would have to be to stop the chickens rotting. When nicely done, the chickens are slow roasted, and almost certainly delicious. I'd like to conduct some confirming research, of course... [Link via Boing Boing]
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