Yep, SRS, the flesh is white and it is a potato - I think a sweet potato is something quite different. The flesh of this one is quite firm and waxy rather than powdery. If you get the chance, try some - you may not get the yields you might expect with other potatoes, but you have something that little bit different and unlikely too be found on the supermarket shelf or even, in areas like this, from a farm shop.

Taste is my judge, and to me these are worth it.