I saw today that Coop has now got organic sweet potatoes. They are Portuguese - batate doce - and have dark purple skin but, when I cut them up, I was surprised to find yellow interior. I'm attaching a googled image although the Coop ones are more dark purple outside and more yellow inside.
They are delicious. I was thinking they would be similar taste to regular sweet potato but the texture is different. It manages to simultaneously be a bit more crumbly as well as creamy, than ordinary sweet potatoes. They steamed super fast, by the time I gave them a check, they were already quite cooked. I have a feeling that frying would be perfect, maybe a frypan full of batata doce crisps. Are there any Portuguese EF-ers out there with national recipes?
The downside is the price - CHF 9 per kg. But I would actually buy them again, not everyday, but say for a weekend meal because the taste is great.