Actually, the Japanese have outdone themselves again and managed a white strawberry purely through experimental breeding. The farmer who managed it refers to them as "Hatsukoi no kaori", or "The Scent of First Love". Pineberries are a similar fruit but are a crossbreed of a wild white strawberry from South America with a hardier strain from North America. They're similar in appearance but taste very different.
Not that it really matters whether Emma is chewing on a pineberry or a Hatsukoi no kaori... it's still hot as hell.