The cuisines of the medieval period were based on cereals and particularly on barley. Later, bread became their basic food and, the majority of the population started consuming bread as their food. Barley bread, gruel, and pasta provided 70-80-% of calories in the 14th century.
https://stillunfold.com/food/scrumptious-foods-you-didn-t-know-were-eaten-in-medieval-times

https://i.imgur.com/PkiKmuD.jpg