Assuming you're referring to actual fruit, the apples of Medieval Europe were typically much smaller and less round than the ones we see today. The Pearmain, Costard, and Pippin strains were most popular in England, while France favored Faro and Reinette. Though I was unable to find a modern sampling of the Costard or Faro apples, the Pearmain, Pippin, and Reinette varieties are still grown and consumed today and you can read more about them here

Source: Food in Medieval Times by Melitta Weiss Adamson