In three separate parts of the country, bakers independently arrived at the same idea: put potato in the donut. Maine, Mississippi and Idaho, with no shared lineage between them.
Potato gives the crumb a denser, moister texture that keeps longer. The convergence is the story — this is not a trend that spread. It is the same good idea, had three times.
Not a trend that spread. The same good idea, had three times.

