If you don’t have a frying pan with you, find yourself a flat rock one that isn’t,
from a river bed, is completely dry and isn’t made of flint or concrete because these could explode once they are heated up.
place your cooking rock on top of two support rocks then build your fire underneath. Light your fire, stand back and let the fire heat the rock up slowly (there still is a risk of the rock exploding).
Once the rock is nice and hot put your food on, be it bacon, sausage, steaks etc and cook as you would in a frying pan. If you are cooking eggs, add a little oil, butter or wait until the fat from the meat is coating the rock surface so it doesn’t stick.