Taiwan is rolling out an official label for homegrown peanuts, good news for local farmers worried about cheap American imports.

• The government unveiled a "Taiwan Peanut" label so shoppers can spot 100% local peanuts on the package.
• Farmers are nervous about a trade deal with the U.S. that would let American peanuts in tariff-free.
• Local peanuts hold about three-quarters of the home market, and officials are pitching them on taste and a smaller carbon footprint.
• Lab testing of the peanuts' chemical makeup will separate Taiwanese nuts from those grown in the U.S., Brazil, and Argentina.
• Mixing in imported peanuts or hiding where they came from can get the label pulled.

Outlook: The label starts with simple products like shelled peanuts and peanut candy, with the testing method set to win official approval by year end and processed foods added later.