Hiyayakko

is a Japanese dish made with chilled tofu and toppings.

Variety of toppings

The choice of toppings on the tofu vary among households and restaurants, but a standard combination is chopped green onion with katsuobushi and soy sauce. Other toppings include:

Shiso leaf
Yuzu rind
Daikon radish
Sliced myoga ginger
Grated ginger
Sliced okra
Plum paste

History and background

Hiyayakko is also known as hiyakko or yakko-dōfu. Hiya means cold, and yakko refers to the servants of samurai during the Edo period in Japan. They wore a vest on which the "nail-puller crest" was attached, on the shoulders; therefore, cutting something into cubes was called "cutting into yakko". "Hiyakkoi" or "hyakkoi", the Tokyo dialectal term equivalent to the standard Japanese "hiyayaka", is also a possible etymology.
In the 1782 recipe book Tofu Hyakuchin, it is said that hiyayakko is so well known that it needs no introduction.
In haiku, hiyayakko is a season word for summer. This is because tofu is often enjoyed cold in the summer, warm and boiled in a broth in the winter.