Otokomeshi

Struggling student Ryouta Yamasui finds himself in the middle of a yakuza conflict. Mr. Ryuuichi Yanagaki, the boss of a yakuza group, saves his life and threatens him to give thanks for saving him, so Ryouta decides to hide them in his room. After taking over the kitchen like he owns it, Mr. Yanagaki proceeds to make a dish using the leftover ingredients from Ryouta's fridge. What is this dish made by Mr. Yanagaki?

(Source: Kodansha, translated)