This early reference notes this stage is unwholesome [Markam]. Medium/medium rare were introduced about this time. Originally only of eggs: slightly or imperfectly cooked, underdone. And indeed, among winged creatures they can eat with pleasure wood pigeons still running with blood and scarcely touched by fire.' Bruyerin advocated the middle way, warning that there would be a penalty to pay for eating either half-raw or 'melting' meat.
Unfortunately, these two aims conflict with each other... The method must be tailored to the meat's toughness.
The ideal method for cooking meat would therefore minimize moisture loss and compacting of the meat fiers, while maximizing the conversion of tough connective-tissue colllagen to fluid gelatin.
Boiling, on the other hand, offered a relatively constant heat, and boiling better suited beef because it cold dry nature needed to be both warmed and moistened.
The distance of both grill and spit from the flame could be regulated fairly well...
And its moisture manifests itself if slipperiness; chewing doesn't manage to liberate much juice. As it cooks, meat develops a firmness and resiliance that make it easier to chew. With longer cooking, the juices dry up, and resiliance give way to a dry stiffness.