Question

what was the professor teaching his colleagues in the cookhouse

Answer 1

the professor preached against the unscientific and unhygienic way of peeling potatoes which according to him could result in loss of vitamin values

Answer 2

One day while the narrator and his friend Trower were returning from the canteen to the hall. They saw three cooks through the open door and they heard The Professor criticising the method of peeling potatoes. He was telling the other two cooks that their “abominably unscientific and unhygienic method of peeling potatoes” wasted the vitamin values of the vegetable. The narrator and his friend heard and fled.