Arab hospitality is legendary — refusing food or drink is considered impolite, so accept graciously. Meals are communal and abundant. It's customary to say "Sahtain" (صحتين — double health) as a blessing when someone eats. Right hand is traditionally used for eating.
من فضلك (min fadlak) — Please, لذيذ (ladhidh) — Delicious, الحساب (al-hisab) — The bill, في صحتك (fi sahetak) — Cheers, شكراً (shukran) — Thank you