There are a number of books on my shopping list right now, so I thought I'd mention a few of them (in no particular order).
Food in Medieval England: Diet and Nutrition
C. M. Woolgar
This book sounds like it combines information from a diverse range of fields. Woolgar's previous works are wonderfully detailed and supported, so this one sounds really promising.
The Book of Sent Soví: Medieval recipes from Catalonia
Joan Santanach (Editor), Robin Vogelzang (Translator)
I'm mostly into English and French cooking history, so why this? Catalan borders on France, of course, and there's almost nothing out there on medieval Catalonian cooking. How much does it resemble that of its neighbors? What ingredients are similar? What are the differences. I just gotta know!
Cooking and Dining in Medieval England
Brears is one of those authors that, when they put out a new book, I pay attention. The combination of the subject with Brears' usual level of scholarship sounds very promising.