Even in manners. Just one more thing from The Rituals of Dinner

“In many cultures, two people do not feel they can talk in a friendly way with each other unless they have first eaten together … A corresponding attitude is that which makes it impossible for a desert Arab who has once eaten salt with a man ever to treat him thereafter as an enemy. It is as though reconciliation must never be needed,  because it has taken place already; enmity has been overcome in advance.”