Have you ever cooked in your car?
I used to make breakfast burritos in bulk and freeze them. In the morning, I'd microwave a couple, wrap them in foil, and set them on the engine block of my Jeep before leaving for work. I'd drive the Jeep all over the jobsite, then mid-morning I'd pop the hood and grab my still-hot burritos. I also used to see the asphalt crews put cans of chili or stew on the burner at the back of the asphalt paving machine in the morning, and have steaming hot food by lunchtime.