Are they not Taro- https://en.wikipedia.org/wiki/Taro which I love the yellow one, but not so much the purple...I used to live in the DAintree RAinforest in Far North Queensland and we used to grow Taro. My ex was from the Cook Islands and he taught me how to cook the white (yellow) Taro as mashed potoatoes or as sweet dessert like Banana coconut pudding using Arrowroot too. Oh so delicious...

And your recipe is such a great idea and so pretty too!

bookmarked so I can make it myself! Yumm!

And we call Sweet potato over here and the Polynesians call it Kumara...http://australiansweetpotatoes.com.au/

Speaking of Kumara, here's my post about it tonight too! @chocolatescorpi/so-i-did-an-experiment-and-ended-up-with-an-almost-vegan-pie