Siamese Strawberry

Last time I checked, America's farmlands hadn't suffered an apocalyptic blast of radiation.  So how to explain, then, this mutant fruit (photographed from both sides) that showed up in a container of strawberries I recently purchased?  The juicy monstrosity (compare the "normal" specimen beside it) looks like several full-sized strawberries melded into one--the produce equivalent of Chang and Eng.  Definitely the fleshiest (and oddest) piece of fresh fruit I've ever encountered.