Ever since Togos went to a lower grade of pastrami and microwaves instead of steaming, The Hat is the only game in town for classic pastrami. I recommend the double-dip au jus.
If you ask nicely, they'll pack a 'lunch kit - with the ingredients and bun and au jus packed separately so you can put it together and nuke it up for lunch the next day.
The pastrami burger with cheese is also awesome, and only order the onion rings if you and company have the appetite to polish off a gallon-size bag!
Pros: fast service, generous portions
Cons: no locations in L.A. or SF Valley.
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