I was looking at their online menu and noticed that they have "hot corned beef" and "extra lean hot corned beef" sandwiches, as well as "hot pastrami" and "extra lean hot pastrami" sandwiches. What is the difference? I've never seen this on a deli menu anywhere. Normally, any decent pastrami has some fat in it, where as corned beef seems to be leaner anyway. So, if we order the regular sandwiches (not extra lean), will they be way too fatty? On the other hand, if we order the "extra lean", will they taste less authentic? Thanks!