Truffles are underground mushrooms. Very expensive and very hard to get. You can find those only using trained dogs or pigs (due to their smell).
It is said that if you put a truffle in your fridge all your products inside the fridge will smell like mushrooms in 24 hours.

http://www.flickr.com/photos/44399808@N07/4106015281/

In big restaurants from Europe "chiefs" can add a mushrooms flavor to any food if they only use one slide from the mushroom. They are used mainly in Italy.

As said they are very hard to get. In Europe you can sell 1KG for 800 EUROS. But that depends because there are many sub-species( black, brown, white, etc...).

Regarding your second question...I can't answer that, but my answer is based on my experience. Nothing from Google here...:)

Hope this helps!
Vlad
Source(s):
My dendrology book...Second year at "Transylvania University". Had an exam subject regrading truffles

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