Of course in a pinch a fork or stick will do nicely. Use your trusty friend, tin-foil. Simply make packages of tin-foil with the veggies inside sprinkled with water. Or as one of our loyal readers suggested put in a couple of ice cubes. This is an old camping trick.
Lets use beans for example.
Take a large rectangle of heavy duty tin-foil. Tip and tail your beans and rinse in cold water but do not shake off. Place in center of foil. Add a little water so that they won't burn. Grab the two long sides, put together over the middle and roll down to make a seam.