Is there an inexpensive substitute for truffles? I recently had a hamburger whose main ingredient was Truffle shavings ($50.00 btw) - I loved the flavor, but can't afford to buy the real ones, any substitutions with similar flavor?
They're so expensive because there really isn't anything else with the same flavor, and they can't be cultivated.

However, they do take some of the smaller ones to make truffle oil, which is much more reasonably priced, and more easily available.