He's been cooking in his quarters for a while. Back during the Carnival event he made an induction cooktop by getting raw materials from the replicators. He's since refined it so that it looks like a large grill on with a cooktop instead of grill grates. He can move it but it would probably take several people and a furniture dolly to move it with him or telekinesis.

Normally it's in his quarters but for this, I figure he'll pull the cooktop off and attach it to a base so it looks like a large griddle and do it in Ten Forward.