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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.
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 ;)