Here's how to make a sandwich the way they do in New York City Jewish delis. If you can, use calf's tongue in preference to beef tongue, but both are good.
New York City
A century ago, in the early days of motoring as a pastime, the young Michelin tire company started a booklet of restaurants to visit along one's travels in France. A restaurant of note was listed with a star, a restaurant worth a detour got two stars, and a restaurant worth a trip all on its own was awarded the rare and coveted three Michelin stars. The idea caught on, and now many decades later, those Michelin stars are big business.
For our twentieth wedding anniversary, we took a romantic weekend in the Big Apple, including dinner at Daniel and a lunch at Jean Georges. The former once had three Michelin stars but now boasts only two. The latter has had three stars for many years. On the other hand, Daniel is the darling of TripAdvisor and Yelp! so maybe the celebrated M. Boulud doesn't need those Michelin stars!
As for us, we agreed that Daniel was an experience maybe worth a detour (but not a $500 detour!).