Katsuobushi, a type of dried and smoked tuna that is often used to flavor dishes and is a key ingredient in dashi.

Karashi, a type of spicy mustard, is often served as a condiment with Japanese dishes such as sushi and grilled meat.

The Tokyo Marathon, first held in 2007, has become one of the most popular marathons in the world, with over 30,000 runners participating each year.