Solar cooking with mylar foil on cardboard and a big sheet of aluminum foil building insulation. On the washing line. Requires a day with no wind or a sheltered location. As we are close to the beach every morning is misty or some cloud cover. I was getting a bit fed up with long cooking times, so rigged up a caserole serving tray to hold pyrex containers with a black ceramic bowl inside. Cooked porridge with ground almonds 1 hour. Beans 2 hours. Rice cooking now for dinner at 3pm.