Gonna ask this here since it seems most appropriate. I've heard about the technique of 'Vacuum flask cooking', where you take a steel lined vacuum flask and fill it with cooking-heat food (with a high liquid content) which has been heated to a boil long enough to kill any bacteria, seal it inside, and let the food simmer in the stored heat for the next several hours. Seems like a good idea for how to make a night's dinner earlier in the day with a solar cooker, for instance. Catch is that while i've heard it discussed, the only recipe i've actually -seen- for it was for steel cut oats. Has anyone else heard of this or know of anything similar?