The Lord Jesus set it up. The fire burned by coals perhaps reminded Peter of his denial, which was also near coals that burned. Peter denied Jesus three times that night. Then three times, the Lord would ask if Peter loved Him. Three times as well, the Lord would commission Peter. Everything was set up for this conversation. But before the dreaded but needed talk, the Lord set up an atmosphere of fellowship. After eating, the Lord Jesus spoke to Peter, which made Peter uncomfortable, to the point of grieving. However, it also reaffirmed Peter’s call to serve and die for His Lord.