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Purple mash potatoes
(lemmy.ca)
My 3yo wanted purple mash potatoes, it didn’t really work because I used yellow potatoes. Then my 3yo decided she didn’t want potatoes so my wife and I were stuck eating prison gruel.
The potatoes never stay as purple as you'd like.
We have these in NZ: https://www.tepapa.govt.nz/discover-collections/read-watch-play/maori/maori-potatoes (last image on the page).
They start out the bright royal purple in the image, but by the end of boiling they turn a blueish-grey colour, and the water will be a delightful maroon-crimson shade.
If you want it to look like you've blended up Barney the Dinosaur, you're going to be colouring them.
My purple roasties come out purple as. Could maybe adapt to a mash without boiling but would need to run them through a ricer or something
Oh yeah, great purple colour when baked or fried.
Boiled, not so much ;)