The pineberry is a member of the strawberry family, with white flesh and red seeds. According to The Daily Mail, the UK's answer to the New York Post and therefore everyone's favorite source for hard-hitting news, the pineberry tastes like a pineapple but looks like a strawberry, hence the name.
It joins another member of the strawberry family that hit big in England this summer, the strasberry. The strasberry is genetically the same as a strawberry, but is smaller and, its seller insists, has a "unique, aromatic flavor" that apparently goes very well with cream and in dacquiris--
--just like some other fruit I know.