The use of truffles in Japanese cuisine is slowly increasing. A common combination of using truffles is with sushi, usually uni or o-toro. Uni makes plenty of sense. In fact, try using some black truffle oil with any uni dish next time and you'll see.
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Beautiful looking Shanghainese steamed soup dumpling, aka, xiao long bao (XLB) with freshly grated white winter truffles out of Shanghai! Looks delicious! I tend to think black truffles pair better with pork, but I guess this will work too! Many restaurants also infuse the filling with truffle oil and because these dumplings are generally wrapped well, the truffle aroma is preserved during the steaming process.
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