That may be true, you dont do one piece of food at a time, but you dont cook them all at the same time. To clarify that, they may be on the stove and all heated up and they may be cooking on their own at the same time by you can only give attention to one of them at a time. You switch from one food to the next. Stir this one, stop, flip the meat in that pan, stop, turn that burner down a little, etc.