KFC's long list of ingredients for their grilled chicken product...includes beef powder, rendered beef fat and other unsavory items (MSG, partially hydrogenated soybean oil, autolyzed yeast, silicon dioxide).
A concerned customer tweeted about the beef additives on El Pollo Loco's Twitter account, capturing the SoCal chain's attention. Sure enough, if you head to KFC's Web site, you can download a long 37-page PDF of these ingredients, right at the end of page 14.