Ibaraki Prefecture's specialties include natto(fermented soybeans), hoshiimo(dried sweet potatoes), and melons.
Products made from these are sold at many michinoeki(s) in the prefecture.
natto ... 06-Shimotsuma
hoshiimo ... 10-Makuraga no Sato Koga, 16-Joso
melon ... 16-Joso