A.T. Robertson Commentary Acts 27:35

"And when he had said this, and had taken bread, he gave thanks to God in the presence of all; and he brake it, and began to eat." — Acts 27:35 (ASV)

Gave thanks to God (ευχαριστησεν τω θεω). First aorist active indicative of ευχαριστεω from which our word "Eucharist" comes. It was saying grace like the head of a Hebrew family and the example of Paul would encourage the others to eat. Probably Paul, Luke, and Aristarchus had memories of the Lord's supper (Acts 2:42) while to others it was only an ordinary meal (Luke 24:30).