Most fish can be cooked right after they're caught, and many can be cooked whole. Just chop off the head, descale the fish, slice through the belly and clean out the entrails. Rinse thoroughly. Wrap each fish in heavy duty foil with some butter, a few slices of lemon (or lemon juice), salt and pepper and place over the heat. It can be cooked on the grill, over the camp fire or in the glowing embers of a dying fire. Check it every ten minutes, as it doesn't take long to cook fish. Unwrap and enjoy!