It was SO MUCH fun and effective.
You will need:
A small vestibule (I used a vintage tobacco tin, obviously)
A whole, fresh beetroot sliced very thinly
An oven or dehydrator
A coffee grinder or nut/grain mill
No children (for some reason they are intrigued with these little mounds of bright pink dust and think playing with it is just as much fun as I think it is, pah!)