Food and Feast in Medieval England gives an excellent brief look at what was eaten in Medieval England, where the food came from (grown or imported), how it was prepared and some of the laws regulating food sales and food production in the cities. It has chapters focusing on the diet of village peasants, city folk and the nobility. An very hefty percentage of people in the Middle Ages were employed almost solely in the making of food- if you want to know what they did all year, seeing what they ate is a good place to start.