Something you often see in recipes for stewing dishes is that you should leave it overnight for a better flavour (for example, it's mentioned in this chilli recipe I just used: http://www.guardian.co.uk/lifeandstyle/wordofmouth/2011/may/12/cook-perfect-chilli-con-carne). In my household it's taken as a matter of fact, and instinctively feels true. But is really? Has anyone actually put this statement to some scientific rigour? I've had a dig around this site, Googled around a bit, flicked through McGee's book, had a butcher's at Modernist Cuisine, yet can't find any concrete information. I'm constantly reading statements like "it allows the flavours to mingle" which is just meaningless, and makes me think this is just one of those cooking fallacies like "sealing meat". For example, in "Meat" Hugh Fearnley-Whittingstall says (in addition to repeating the seemingly meaningless "mingling" statement) that the cooling "settles the texture of the meat giving it a chance to re-absorb the liquid", but I understand resting meat to be more about letting the juices gel a little and to help prevent further moisture loss on carving, and that "re-absorbing moisture" is not something that is physically possible. Personally I suspect it might simply be down to the re-heating process causing further reduction, thus concentrating the flavour a little more, and nothing more to it than that. But I would love to know firstly whether there's been any testing done in this area to prove whether this is fact or fallacy, and if fact what the scientific reason for this phenomena is. Any ideas?