The top isn't a mess of food. This is largely dependent on what you cook. Fish skin sometimes gets cooked on, glaze bubbles and chars, oil lights on fire and the top surface chars. Something like shrimp, tomato, or sausage will be fairly clean though, and nothing will cook on to the top.
Impairment of language, usually caused by left hemisphere damage either to Broca's area (impairment speaking) or Wernicke's area (impairing understanding, damage in rear parietal/temporal region in the left hemisphere)
The Broca's area and Wernicke's area, that contain motor neurons, are the language processing units of the brain that help in understanding language as well as allow us to communicate properly. These are the language centers of the brain, and their proper functioning is very important to comprehend and speak any language.