A Homemade Thermos Cooker, by M.P.
A thermos cooker is an energy saving cooking device. Earlier versions were a vacuum thermos that you placed uncooked food and boiling water into and then sealed it up, and in a few hours you had cooked food. Later versions have a pot that you put your ingredients into and place on your stove; you then bring the contents to a boil and place the pot into an insulated outer pot to hold the heat in and cook the food. Thermos cookers do not speed up cooking times; they only save energy, and in fact cooking times can be significantly …