Of course, the Solar Funnel works much better outside of winter
days (when the UV index is 7 or greater). Most other solar
cookers will not cook in the winter in northern areas (or south
of about 35 degrees, either).
I thought that a pressure cooker would be great. But the
prices in stores were way too high for me. Wait, how about
a canning jar? These little beauties are designed to relieve
pressure through the lid--a nice pressure cooker. And cooking
time is cut in half for each 10 degrees Celsius we raise the
temperature (Professor Lee Hansen, private communication).
I used one of my wife's wide-mouth canning jars, spray-painted
(flat) black on the outside, and it worked great. Food cooks
faster when you use a simple canning jar as a pressure cooker.
However, you can also put a black pot in the plastic bag instead
if you want. But don't use a sealed container with no pressure
release like a mayonnaise jar--it can break as the steam builds
up! (I've done it.)
III.
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