sweet potato
芋 いも イモ 薩摩芋 さつまいも サツマイモ 红薯 番薯 地瓜
Also called a camote, it is a type of tuber vegetable that isn't as starchy as the potato, but instead has a sweeter taste. Tends to be mislabeled as a yam, but they are from an entirely different botanical species. This is also known as a food that makes you gassy. Hence why you see many artists draw fart illustrations as part of the gag.
In Mexico, Bolivia, Peru, Chile, Central America, and the Philippines, the sweet potato is known as camote
Popularly associated with Aki Minoriko because she wears a sweet potato-scented perfume, and has a spellcard named after them in Mountain of Faith.
Shiratsuyu and Chiyoda of Kancolle fame is also pretty fond of them.