“Dining in the Kingdom of God” is a great book on St. Luke authored by the late Fr. Eugene A. La Verdiere.
He describes the 10 major meals in Luke’s Gospel and shows how each of them provides an insight into a particular aspect of the Eucharist especially those meals of Christ eaten with the outcasts and the marginalized.
He tells us that the meals eaten by the risen Christ puts to rest any theory that it was all an apparition. As in the Emmaus passage, “their eyes were opened and they recognized the Lord in the breaking of the bread.”
Then maybe you can explain Matthew 28:17 which reads:
"When they saw him, they worshiped him; but some doubted. "