We've finally begun to experiment with the techniques devised by Maynard and Scheller. They have whole meals you can make, but our ride today wasn't going to be that long, and we were nervous on our first time out, so we did the easiest thing possible.
1) Find a nice flat place on your engine block.
2) Triple-wrap in foil a pita stuffed with shredded cheese.
3) Place it in the space you found on your engine block.
4) Drive to the zoo, to the beach, or wherever.
We opened up our packet at the zoo and my husband had a warm sandwich with gooey, melty cheese all ready for lunch.