There are dozens of these threads on FT. Not so much about DL and this route. Bottom line is that there are a significant # of people who are not O&D JFK-TLV and are functioning on all manner of schedules in 24 time zones (perhaps not so many from the Aleutians or Siberia).
Thus, most carriers worldwide simply serve meals based on a local schedule in J. In F, which DL doesn't offer, there's no set service so one can choose the service order and often pre-order specific dishes. But, again, that's F and that's not DL.