LINDA WERTHEIMER, HOST:

Good morning, I'm Linda Wertheimer.

Clean your plate. You heard that from your mom. Now a restaurant in Sapporo, Japan says that to its customers. If you order their signature dish, it's all you can eat - a bowl of rice topped with salmon roe - you must eat it all or pay a fine, which goes to hardworking fishermen. But one server says that hardly ever happens because most diners clean their plates.

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