Note 6 at Joh 6:34: It is probable that these Jews were expecting Jesus to rain down manna on them like it had happened in the wilderness. After all, anyone who could feed 5,000 men with one small lunch should be able to produce manna. They were still thinking of physical food.

Although they were looking for pieces of bread to materialize, which would have been a great miracle, it would have been insignificant compared to the miracle of God being manifested in the flesh (1Ti 3:16). They were talking to the greatest miracle that God had ever performed, but they were blind to that fact. Many times we are so intent on seeking God in one area that we forget the greatest miracle of all--the love and redemption given to us from God through His Son.