Egg whites, dried kiwi, a little brown sugar, a little cinnamon, a little vanilla, a few other little things -- that's all that Bruce Harrison, owner of Sweet Bob's, will say when you ask what's in the sauce that comes with his sweet-potato fries. But those words don't even begin to describe these frites, which become as sugary as candy and as addictive as heroin once they're set to soaking in Harrison's secret sauce. Imagine a kiwi cake frosting melted over soft, fried sweet potatoes. Or your grandmother's best sweet-potato pie topped with warm syrup. Hell, imagine anything you like -- but get down there and give these spuds a try.