Umeboshi

Umeboshi is a type of fruit that comes from the ume tree, which is kind of like a plum tree. When the fruit is still green and not yet ripe, it is picked and preserved in salt. This makes it very sour and salty.

People in Japan have been eating umeboshi for a really long time, and they are often used as a condiment or flavoring in dishes like rice balls or noodles. They are also believed to have some health benefits, like helping with digestion and preventing sickness.

Overall, umeboshi might be a little too sour and salty for some people's tastes, but lots of people really enjoy their unique flavor and use them in lots of different ways in their cooking.