A cast-iron pan with hemispherical molds used to cook takoyaki (octopus balls).
See also: たこ焼き
I bought a new takoyaki pan, so let's have a takoyaki party this weekend.
This takoyaki pan is for gas stoves only.
Compound of たこ焼き (takoyaki, octopus balls) + 器 (ki, vessel/utensil).