Oh, I've got goosebumps. I went googling for the Hamburger Inn because I felt certain I would've eaten there at least once. I was "stuck" in Ardmore for quite a while when my ex-hubby was on a lease ticket at the courthouse and we had to eat "out" every meal for many weeks.
Sure enough, I found it. Hamburger Inn is still there and still getting raves. It is definitely the onion burger that is its claim to fame, which explains why I didn't recall it. We had a favorite onion burger place in Chickasha and since we lived in OKC at the time, it was closer when we got a craving.
But while in Ardmore, my hubby would sometimes bring sacks of burgers back to the motel - and those were from Hamburger Inn! I just never went inside and ate there - but did drive by the window a couple of times. Yummy!
We had another favorite place at the time which is gone now, but it was just for lunch - a buffet with all you can eat for $5 and they had petite filet mignons that were fork tender and perfectly cooked - I could eat 2-3. So, we were always full at lunch. That was called the Gourmet, run by Mazola, who had been the mayor of Ardmore. Her brother was named Lieutenant, lol.
What gave me goosebumps was that I found out that the cook at the Hamburger Inn (where "educated" hamburgers were first called that, by the way) was the same one who made the burgers at Bill & Barb's (now defunct) that I loved so much.
We were raving about the same burgers, except I got lettuce, mayo and fresh onions on mine, in addition! Too funny.
I don't mean to hijack this pizza thread with burger talk, but have some cool stuff I found that I'll FReepmail you.