KIMBERLY, Idaho (AP) -- From the fields of Idaho to tasting rooms in suburban Chicago, potato farmers, researchers and industry representatives are in the midst of an elusive hunt: finding a new spud for McDonald's french fries.

A decade has passed since the fast-food giant last added a new U.S. potato variety to three others approved for its golden fries, something that both irks and motivates potato researchers who hope their progeny will be next.

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