What came first: chicken, egg, or truffles growing in its flesh?

Marc "guiding light of the geek cuisine movement" Powell IMmed me the other day:

(14:31:50) Marc: In the Pyrenees sometimes they bury a raw chicken in the ground after stuffing it with truffles — the truffles keep growing and releasing their flavor throughout the chicken meat
(14:33:41) Xeni: omfg weird!!!
(14:33:21) Marc: it's aged in the ground then they poach or roast it afterwards
(14:34:04) Xeni: ewww!!! but doesn't raw chicken rot when it sits around in a grave for weeks?
(14:33:55) Marc: yah that's aging beef rots too when they dry age it

Link to more about this strange culinary practice in a forum on egullet.

Previously on Boing Boing:
"Xeni Tech" on NPR: Food Hackers make high-tech geek eats