Yu☆Gi☆Oh! Duel Monsters GX

Synopsis

With Professor Banner gone, the quality of the food in the Slifer dorm had gone down. A mysterious chef comes to the dorm and offers to cook if Hassleberry could beat him in a duel. If he lost, the Ra students at Slifer Dorm would come back to Ra. The chef uses his food-monster cards and eventually reveals himself to be Professor Sartyr, the headmaster of the Ra dorm. He came because Ra dorm had been empty lately with the students going to Obelisk Blue or hanging out at the Slifer Dorm. Hassleberry defeats him, proving that he can get stronger even at Slifer, and that he shouldn't force people to leave a place they like. He cooked them a great meal.

(Source: Wikipedia)