Route 66 Style Grilled Onion Burgers around Phoenix?
I've scouted around here for some time searching for a place that serves my favorite style burgers - those Route 66 grilled onion burgers - thin patty, made from fresh ground beef - never frozen, never preformed - smashed right onto the grill with a spatula, onions grilled in. I've eaten them many times in Oklahoma (J&W Grill in Chickasha - Johnnie's in El Reno), if anyone is familiar with those places or places like them.
I can't always tell from the descriptions which restaurants around Phoenix are closest to this style of burger (In & Out is okay, but doesn't cut it for me). I'll be in town at the end of April and would love to find them if anyone knows.
The closest match I can think of is Smashburger, a chain based out of the Denver area. They have a few location around the Phx metro area. Smashburger cook its burgers by smashing them on the flattop, and grilled onions are offered as a topping. You might be able to convince someone there to make a burger for you in the fashion you describe, given that it doesn't sound like a huge leap from what they typically do.
Perhaps someone else knows of a place whose default burger is along the lines of what you've described.