According to my research, eggs need a temp of 185 degrees or higher to cook. Sidewalks don't get that hot. But thinking outside the box... here are a few suggestions:
- Find a large rock with a slight indention. Clean a little OR place a piece of aluminum foil over the rock. Allow to heat in the hottest sun. Make a ring with biscuit dough, and in the middle crack an egg or two. Loosely "tent" another piece of aluminum foil over the food and cook.
- Use a cast-iron or regular skillet in this one. Place a pane of glass on the sidewalk or rock. Place your skillet on it. Add food to be cooked to the skillet. Place another pane of glass (or a glass top) on top of the skillet.
I'm sure you couldn't do a pot-roast like this, but on a hot sunny day, I know for a fact you could do an egg-and-biscuit meal.
Are you going to experiment with this? Let us know how it goes, how you did it, what you prepared, how quickly it cooked, etc.