Namasu
Namasu is a Japanese dish consisting of thinly sliced uncooked (nama) vegetables and seafood, marinated in rice vinegar (su) for several hours, pickling them slightly. Namasu was brought to Japan from China during the Nara period (710-794). Namasu may also be called namasu-kiri (kiri means "sliced").
Source: Wikipedia
Recipes
Namasu (Japanese Daikon and Carrot Salad) - a perfect side for grilling
Namasu is something of a mystical dish. This simple salad of daikon radish and carrots is as simple to make as the similar tsukemono (overnight pickles), but is ready in just about 15 minutes. Namasu has a tangy-sweet flavor and incredible crisp texture...