At my job? I take food ingredients and perform some manual manipulation to arrange them into enjoyable edible form (although the natural gas powered grill and the electric element powered heating elements, via cooking oil perform the bulk of the "work" in terms of watt-hours), and contribute to the maintenence of the facility and equipment that allows that to happen. Per shift (along with 1-4 coworkers) I think I am involved in preparaing late breakfast or lunch for approximately 150-200 people, saving them perhaps dozens of minutes from preparing the equivalent meal themselves. (don't worry, I dont think you owe me too much respect).