watso may have posted about the matter a couple of summers ago...
HOWEVER ... watso picked up some great marinated roast beef a couple of summers ago in - in vacuum sealed bags..
watso is into solar cooking , and the way watso does it - it is sort of a bit like sous vide ..
anyway - in the vacuum sealed bag - the marinade has no where to go - and there was minimum shrinkage - and the roast beef was amazingly tasty and tender .. watso cooked it all day(well obviously not the full 24 hours) ..
