For decades, sweet potatoes have been a holiday favorite. In the past decade, they've popped up increasingly at restaurants catering to diners eager for something new.  ConAgra hopes to make the sweet potato a modern-day equivalent of its stepbrother, the russet potato. In the mid-1940s, entrepreneur J. R. Simplot developed the frozen French fry, thus elevating the russet from kitchen staple to multibillion-dollar franchise.
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