Global Solar Oven

Preserve the planet, use no fuel and cook anywhere the sun shines; all while baking a batch of cookies with the Global Sun Oven. The oven can reach temperatures of 360 to 400 degrees Fahrenheit using nothing but the power of the sun. The unit is about as large as a small suit case; unfolding the solar mirrors into place makes it about as large as a heftier camping grill.

Used in over 126 countries around the world in all four seasons, the Solar Oven is a work horse in clean renewable energy for cooking on the move.

From the Sunoven.com FAQ page:

Can I use a GLOBAL SUN OVEN in the winter?
Yes. The most important factor in using a GLOBAL SUN OVEN is the brightness of the day, NOT the outside air temperature. Often, a 40-degree, clear, low-humidity day will allow food to cook faster than a 100-degree day with high humidity. The GLOBAL SUN OVEN has been used very successfully at the base camp of a Mt. Everest expedition where the temperatures are often well below zero. There are, however, more cooking hours available in the summer than in the winter. In the early summer, it is not unusual to cook from 8:00 AM to 6:00 PM, whereas during the early winter, effective cooking is limited to 10:00 AM to 2:00 PM.

Available at SunOven.com for $189.00 with a 30-day money back guarantee.