Tim-Toms
Best burgers in LA since the 70's, went out of business a few years back and got replaced with a Burrito Factory.  Sad day, even though I do love Burrito Factory.  Will probably never have a burger that good ever again.
I also used to live down the street from the OG Tommy's in Echo Park and that shit is bomb as fuck.  Way better than the new ones they put up at universal Studios and places.
On the way to Mt High there is a place called Charlie Brown Farms and you can get burgers made out of anything there.  Salmon, Buffalo, Ostrich, Kangaroo, etc, etc.