What's yellow and lies on the beach?

We all know that Brent Geese prefer inter-tidal foods where available in sufficient quality and quantity. It's certainly the food of choice in terms of its digestibility and nutritional quality. But not all inter-tidal food is green and slimy. Check this out: http://10000birds.com/brant-eating-banana.htm

which is a description and more pictures showing this!

But is it a banana or is it something else?