the basic imformation of Japanese Plum
・・・・It is from Japan guide.com.
The actual ume fruit is more sour than the western plum or apricot, and is usually processed in various ways before eaten.
The most popular processed form is the umeboshi, a sour, pickled plum that is usually enjoyed with cooked rice. The umeboshi has one of the most typical Japanese flavors. Umeshu, a sweet alcoholic beverage made of plums, is also very popular.
This block is quoted from Japan guide.com.
Most Japanese eat Umeboshi with rice like this. To see it, we can't stop tasting sour as if it were in the mouth.