His devotion to cleanliness is well known; when first starting in the restaurant trade he decided to use disposable utensils, despite higher costs.
在評鑑過程中，基金會的學者專家曾提供李延生一些改進的意見，他也都虛心接受。例如採用不鏽鋼的烹調用具；使用不同砧板切生菜和熟菜，用畢立即徹底洗刷等。