Edible Dahlias?

So this might be old news to some, but apparently Dahlias are edible.

In fact a Swiss company called Lubera has bred several varieties just for eating. There is an article in today's Telegraph Gardening section about it and I must say that it seems jolly interesting.

I think I may be placing an order. My late grandfather would have loved this. He loved his potatoes and his dahlias in his garden, and to be able to combine the two would have given him great pleasure I think. My only grip, which is incredibly minor admittedly, is that the flowers of the dahlias in question are not the open type. I just prefer them to the cactus types. Still, an edible root you can grow in a pot to lift and save year on year, and also get a nice floral display off of is a very tempting proposition. Break off the most tender tubers to eat, and save the mature root and a couple of new tubers to keep the plant growing to plant next year. And of course keep cutting the flowers to get them.

[note: Lubera also do Arctic Cloudberries, which sadly I do not have room to grow.]