On September 30, 2013, I visited north western Kawasaki (a neighboring city west of Tokyo) and took these photos of kakis, traditional fruits in autumn. Kakis are nutritious: especially rich in vitamin C. There are sweet kakis that you buy in supermarkets, and there are also bitter kakis that are mostly desiccated (in the process they become sweet). Perhaps, the following idiom best describes the fruit; "When a kaki turns red, a home doctor turns pale." It is said that by eating a kaki, you won't need to go to a doctor.
Here is a famous haiku by Shiki Masaoka (my shot at translation into English): "Biting a kaki, a temple bell rung at Horyu-ji."