Mr Moosa is famous for making one particular dish. Even though he prepared a bad dish on one occasion, when his performance appraisal was conducted at his organisation, he was still rated the best ?

It is possible that Mr. Moosa's reputation for making that particular dish is so strong that it outweighed the one bad dish he prepared. Additionally, his overall performance and skills in the kitchen may have been exceptional, leading to him being rated as the best despite the one mistake. It is important to consider the overall performance and impact of an individual, rather than focusing solely on one isolated incident.