Hiyayakko

Hiyayakko (冷奴) 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 (dried skipjack tuna flakes) and soy sauce. Other toppings include:
 * perilla leaf
 * yuzu rind
 * daikon radish
 * sliced myoga ginger
 * grated ginger
 * sliced okra
 * plum paste
 * mustard

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 (e.g. tofu) into cubes was called "cutting into yakko" (奴に切る). "Hiyakkoi" or "hyakkoi", the Tokyo dialectal term equivalent to the standard Japanese "hiyayaka" (冷ややか), 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.