it gave no offense , but it was not received with quite the gravity he had hoped for : indeed liu bao laughed uproariously when laurence had described the effects of the mushroom ; and when laurence suggested that perhaps they might organize a more regular and limited set of dishes , yongxing dismissed the notion , saying , `` we can not insult a tien-lung by offering him the same day in and day out ; the cooks will just have to be more careful . ''