Why the plastic leafs in Japanese food?

April 25, 2011 at 9:24 pm (Sushi and sashimi)

“Tsuma, made from daikon radish, is typically separated from the fish by a leaf known as ooba (now often plastic). Each has a meaning: The tsuma represents Mount Fuji, the leaf represents land, and the fish the ocean.”

The Sushi Economy pg 136

Sounds very unlikely to me. To start with, is it only sushi that has plastic leafs?

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