Sun Frost, located in Arcata, California, USA, is a company interested in the research and marketing of sustainable energy-efficient products. They are the designers and manufacturers of the Sun Frost Cooker-Sterilizer. The company has had extensive experience with highly efficient refrigerators and composting toilets, and recently have begun to manufacture a solar cooker that incorporates an evacuated tube. The evacuated tube permits reaching extremely high cooking temperatures around 316°C (600°F). Even at these high temperatures the outside of the oven is still close to room temperature. They recently used the ovens to make popcorn and roast coffee, two processes which require relatively high temperatures.
In developing countries disposable needles are often used for vaccinations, safe disposal is a problem. The used needles can be dropped in the oven, when full, the cooker is placed in the sun. Sterilizing the needles and safely submerging them in melted plastic.