Alissa NelsonLast week, while browsing the wares at Local Harvest Grocery, I encountered the biggest beets I'd ever seen. They were like cow hearts. I considered staging the Harrison Ford sacrifice scene from Indiana Jones and the Temple of Doom, just for dramatic effect. Then I saw a sweet potato that was the size of a head, which would have served the role of monkey-head soup tureen. How can you pass up produce like that?According to proprietor Maddie Earnest, these monstrous root vegetabl