I'm awfully fond of Original Joe's in the Tenderloin, where you will be greeted by the 80-plus year old owner. Lunch is best; they leave the meat out on the counter all day and it can get a little livery by dinner. Sit at the counter. They have an awesome ancient Lazzari-burning charcoal grill. When you order a burger, the cook will grab a big handful of meat out of the hotel pan-ful in front of him, grab another handful of chopped onions, and work the two handfuls together with his dogleg spatula. Warning: he will put it on the griddle instead of in the char-broiler if you don't ask. It comes on a big chunk of toasted, buttered French bread. It kicks ass. Again, sit at the counter. They have a great old-fashioned line running the length of the restaurant. All the waiters wear these polyester tuxedos; most are ancient European men. If you go on Friday, you will see a magnificent and hilarious sight: an enormously tall and fat line cook making the special of the day, fried calamari. I'll post a detailed description of said cook if anyone wants me too. Enjoy.