Responsa for Gittin 118:11

Q. Is a Kohen permitted to forego his prerogative and allow one not of priestly lineage to lead in saying grace after a meal?
A. Yes, he is permitted to do so.
This Responsum is addressed to "My teacher, R. Asher," i. e. R. Asher b. Moses.
SOURCES: Cr. 7; 8; Pr. 107; Mord. Git. 401.