- 1). Check both cardboard boxes for holes or tears. Patch any holes thoroughly with duct tape and paper or cardboard to prevent heat loss while cooking.
- 2). Paint the interior of the smaller box black. This will help your oven convert sunlight into heat, raising the internal temperature and cooking your food.
- 3). Place one box inside the other. Tear or cut paper into half-inch strips and pack into the gap between the boxes to serve as insulation.
- 4
A nearly-completed cardboard solar cooker.
Cover the flaps of the outer box with aluminum foil, using duct tape to hold foil in place. The flaps will become reflectors, focusing sunlight into the oven's interior. - 5). Place food inside the solar cooker, along with a thermometer so you can gauge the temperature.
- 6). Cover your oven with a sheet of clear glass or Pyrex. Weight it with bricks or rocks: the added pressure will increase the oven's heat retention.
- 7). Place the solar cooker in direct sunlight, and position the "reflector" flaps to focus maximum light toward the interior of the oven. Use duct tape if necessary to secure the flaps into place.
- 8). Watch your oven carefully to make sure it reaches a temperature of at least 200 degrees F. If you are cooking food containing raw meat or eggs, be sure to check the internal temperature using a meat thermometer.
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