If you can access the seforim, the acharonic discourse on the kashrus of turkey is a fascinating read. The potato missed the kitniyot designation by arriving late to Europe. The Rama in Hilchos brochaos mentions ” the new vegatable” as a subject of shehecheyanu but rules it out because the storage ability takes away the seasonality. Rav Moshe ztzl, in a tshuva on peanuts/kitniyot ends with an “Ode to the Potato” saying that this wonderful thing was the basis of their chiyyus.
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