Umeboshi is a plum pickled with salt and red Perilla (赤紫蘇: Aka Shiso) which tastes sour and salty. You can eat Umeboshi except seed. As fermented, it is good for intestines. There’re also low salt Umeboshi, honeyed Umeboshi etc. Umeboshi accompany Japanese traditional meals, Bento (弁当: Home pakced meal/take out meal) but also used as salad dressing, Pasta, topping for Hiyashi Udon (冷やしうどん: cold Udon Noodle with topping and sauce) etc.