It's not the soup itself.. it's the smell of the oniony wind it produces. If onions can deter a carrot fly and cabbage moth, I'm certain it will work for zombies.
It's simple, you waft a sock full of chopped raw onion under the zombies' noses, their eyes fill with tears and they can't see where they're going. Works for me.
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“It's still magic even if you know how it's done.”