I highly recommend South Philly Taproom. Not sure how many folks go there for weekday lunch, but I would think it would suit you well.

Good Dog (among the very best burgers in the city) is another solid choice, although I suspect they get more crowded at lunch time given their location.

Human Robot (IMO the best brewery in the city) has a great sandwich shop inside of it (Poe's).

Memphis Taproom and/or Local 44 should be on your list as well.

 

> just wish I didn’t have to unhinge my jaw to take a bite

100% this. If I need a knife and fork to eat a burger, it's a poorly-constructed burger.