A real corned beef and pastrami sandwich from a NY deli; had plenty, but want the authentic experience

 
You will get a real corned beef or pastrami sandwich, and it will likely be stellar, however in order to relive that “authentic experience”, you would have to travel back in a time machine about 5 or 6 decades ago, as you will be dining with tourists like yourself and the deli employees will not be old crabby Jewish men (they all died decades ago)