Eating Dahlias

Lis (my wife) is reading a Winston Graham book that mentioned eating dahlia roots as an alternative to potatoes. So, as you do, I googled "eating dahlias". It turns out that these were originally from Mexico and were, at one time, a low cost alternative to potatoes. I never knew this.

See http://www.bbc.co.uk/food/0/22185875 .