Sweet potatoes and a dream: Can an old-school bakery still thrive in D.C.?

April Richardson didn't know a thing about frosting. Until a few years ago, she refused to even eat cake.So Richardson, the president of a suburban Maryland bakeshop, was at a loss when Starbucks responded to a lark e-mail earlier this year and asked her to send a few samples of her wares to its Seattle headquarters. Her sister Deborah started Googling: How do you mail cake?