I'm kind of a "love your neighbor" kind of guy, so I think it would be wise to sit down with the zombies and find out what they're so upset about.

They like eating human brains? Okay, maybe there's a soy-based alternative we can make that will satisfy their desires. Like a scarecrow with a mind made out of tempeh (it already looks like brains anyway). Perhaps they just need a friend to talk to. If you were undead, wouldn't you be kind of confused and grumpy, too? If all else fails, I'd simply decapitate them with a machete.