Story by Robin Davis l Photos by Jodi Miller When it comes to soft-serve frozen yogurt, you have two choices: sweet or tart. Sure, there's an ever growing number of frozen yogurt shops in the Columbus area-and some of them offer a dozen flavors or more, not to mention scores of toppings and sauces. But you can't embark on those choices until you pick sweet or tart. Me? I'm a tart girl. Origin...
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