I personally want to see two things added to cooking in gw2; marshmallows and carolina reaper peppers.
the marshmallow could be a consumable ingredient that is used to make smores when combined with chocolate and graham crackers.
the carolina reaper (which I think should be renamed the Maguuma reaper pepper in game) would just be plain funny since it’s the hottest pepper in the world, and you could make it so that any recipe that uses it causes the player to randomly breathe fire.