Because I like these kind of silly details (just like climate and such), what kind of cuisine do each of the races/countries/cultures have? I have searched a bit on the internet and found an interesting recipe site.
http://recipes.medievalcookery.com/
And the stuff that is travel (eg, larp) safe.
http://www.medievalcookery.com/recipes/indextrv.html
Especialy this one sounds rather easy and nice!
http://www.medievalcookery.com/recipes/crusterolle.html
same goes for
http://recipes.medievalcookery.com/bukkenade.html
I think such foodstuffs can increase the consistency of a world, and if you take the extra effort of making stuff like this beforehand and eating this as a lunch, that would be so awsome, and you wouldn't need to go OC to have lunch. In the past I have experimented with taking dry sausages (brabantse met-worst is ideal) with me, together with turkish bread (the large flat and soft ones). Works quite well for a travel ready character. I actualy carried that food around for the entire event, together with watter (I was playing a nomad, for whom it made sense to have travel rations and watter with him).