Hiyayakko

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.

Hiya means cold, and yakko refers to the servants of samurai during the Edo period in Japan.

"Hiyakkoi" or "hyakkoi", the Tokyo dialectal term equivalent to the standard Japanese "hiyayaka" (冷ややか), is also a possible etymology.

[citation needed] 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.