To clarify, I'm not a New Yorker, so I'm not a corner-deli-cold-pastrami-on-rye-with-mustard kinda guy. Sure, there are some authentic-feeling deli's in the metro area (I say "authentic-feeling" cuz any New Yorker reading this will argue that the only "authentic" deli's are in NYC -- the same ones that say that pizza places outside of NYC claiming to serve "New York style pizza" are frauds since you need to use NYC water to make authentic NY style crust.)
I'm a So Cal native, so I like my pastrami steaming hot from dripping stainless steel troughs, piled high and fatty on a french roll, dipped in some au jus, with a miniscule dab of spicy brown mustard and kosher dill pickle slices lining the bun.
Open faced, open mouth, iron stomach, pass the freakin' Tums.
Where I grew up there were two greasy joints that served it up the way of the So Cal pastrami samurai...
The Hat - $6.49 for pastrami that is both extra lean and fatty at the same time, then dipped in au jus to become heaven on a bun. For extra punishment, try the double-cheese-pastrami burger. Yep, it's viciously that good.
Top's - $6.29 for a pastrami torpedo worthy of a Tim Burton themed, gluttony induced nightmare. Feeling suicidal? Try the chili-cheese fries (half order only, since a full order will feed all the Katrina hungry for a year). Just don't the let chili-cheese cool off, or you'll need to rent a jackhammer from Home Depot at $50-a-day to get to the fries underneath.
I google'd "pastrami oklahoma" and came upon this fellow's website. He's a paper pusher at OU and in his profile professes to be on the search for "a quality pastrami sandwich in the metro area."
I emailed him and he wrote right back.