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Hi Todd,
You could try to reach out to Linett and Simon Cartwright (@Simon-Cartwright). Last year at the congress they had a talk on that very topic. They will be talking on the introductory track of the congress this October in Kentucky.
From my experience visiting highly producing operations in Spain and from the answers to my questions, I gather the following:
Unlike button mushrooms, truffles are tough and “water proof”. You can safely brush them and you should use water (lots of water) to loosen the dirt. Some people are using high water pressure jet to clean the truffles.
Some people are advocating the use of ultrasound cleaner (like for jewelry) to clean every small cracks.
Storing should be at around 4 degree C
Packaging, your enemy is mold. You want to keep enough moisture so that you don’t dedicate the truffle (problem with rice), but not too much so that the truffle sweat and mold forms. Remember that truffles are leaving organisms that need breathing. If you place them in an airtight container, you should open daily to give them a breather.
Freshness is paramount. Our competitive advantage against European truffles is that we can’t be beaten on freshness. I have been told that T. melanosporum have about 15 days shelf life and every day it is loosing 10% of its quality. Every day counts.