Some of you may find this of interest :
expositions.bnf.fr/gastro/enimag ... /index.htm
My Magus, Safran of Merinita is a fine cook and i was searching for information 
Great find.
Dont forget though that its not allcovering, but for southern/western Europe(France and nearby is clearly the focus) it seems unusually accurate(if slightly mixing of regions at times).
Really excellent.
well, i think it's normal that it's at least a little accurate it's coming from the BNF : the french national library.
they have other medieval topic covered but they're not in english.
[EDIT]
You can find other topics here :
I actually didnt check what the website address meant. 
Yeah i guess you can expect some degree of accuracy from such an institution. 
Thank you for sharing this.
Great resource!
-DC