A grill was convenient for flat meats, a spit for larger cuts. Roasting, the application of direct heat at close proximity, was appropriate for a cold, moist meat such as pork because the open fire would warm and dry. That medieval French cooks too this warning seriously and rarely roasted their beef is evident in the large stocks of beef bouillon that our recipes imply was always on hand for ready use in other preparations." ---Early French Cookery: Sources, History, Original Recipes and Modern Adaptations, D. If the ignorant cook were to subject beef to a roasting, so further drying its already dry nature, this could be quite dangerous to the unfortunate person who was to eat it later, and could even put him or her at risk of an attack of melancholia or a bilous upset. Joannes de Mediolano Regimen Sanitatis Salerni sig. It is important to remember that because meat was relatively tough and frequently salted to prevent spoilage, it was often necessary to rinse it in milk and boil it once or twice before using it in a specific recipe." ---A Taste of Ancient Rome, Ilaria Gozzini Giacosa, translated by Anna Herklotz [Univeristy of Chicago Press: Chicago] 1992 (p. Meat was oven-roasted, spit-roasted, used in patties, stuffings, and stews, or...cooked on a grill...
Tough cuts are best heated for a prolonged period at temperatures approaching the boil, usually by stewing, braising, or slow-roasting." ---On Food and Cooking: The Science and Lore of The Kitchen, Harold Mc Gee, completely revised and updated [Scribner: New York] 2004 (p.
167 Coole endiffe, radish, new egs rosted reare, And late-prest cheese; which earthen dishes beare. Ovid Baucis & Philemon in Fables 159 New-laid Eggs, which Baucis busie Care Turn'd by a gentle Fire, and roasted rear. Recipes for hours-long braising or stewing were developed for mature animals with substantially cross-linked collagen that took a long time to dissolve into gelatin.
Fat coats and lubricates meat fibers during cooking, and stimulates the flow of saliva and creates the sensation of juiciness no matter hwo dry the meat fibers themselves have become.
The texture of raw meat is a kindk of slick, resistant mushiness.
The fluid release is at its maximum when the meat is only lightly cooked, or done 'rare.' As the temperature increases and the meat dries out, physical change gives way to chemical change, and to the development of armo as cell molecules break apart and recombine with each other to form new molecules that not only smell meaty, but also fruity and floral, nutty and grassy (esters, ketones, aldehydes)...
Simple physical damage to the muscle fibers causes them to release more of their fluids and therefore more stimulating substances for the tongue.