Uncommon seems like a useful term to me. That said, to me it’s helpful when a non-local fruit or vegetable is identified in some way by the cuisine(s) in which the produce is used. That helps me research recipes when the produce looks interesting to me.
Another identifier that’s useful to me can be the place of origin, when the place/region/country where the item is grown is noted for quality product or is recognized for certain desirable characteristics.
