Jamieson, Fausset and Brown on Genesis 43:31

Ge 43:31-34. The Dinner.

31. Joseph said, Set on bread--equivalent to having dinner served, "bread" being a term inclusive of all victuals. The table was a small stool, most probably the usual round form, "since persons might even then be seated according to their rank or seniority, and the modern Egyptian table is not without its post of honor and a fixed gradation of place" [Wilkinson]. Two or at most three persons were seated at one table. But the host being the highest in rank of the company had a table to himself; while it was so arranged that an Egyptian was not placed nor obliged to eat from the same dish as a Hebrew.