The World is a BURGER
Yet another higher quality burger place/chain that makes it fancy with interesting topics like blue cheese and bacon. If you have to have a burger and fries this is the place to go. A small shop so be prepare to have a buddy snag a seat while the other places the order.
Quality fast food
This Castro location was the first and now Super Duper is a chain with outlets all over. The burgers are consistently amazing with good fries. Get the Super burger (a double with their secret sauce) you won't be disappointed. Gets pretty busy a bit on the later lunch side (1pm), so come early or a bit later to get one of the seats in the window or outside.
Skip the chicken, it's all about the burgers here.
Good food, poor condiment selection
I was a little annoyed the first time I went that you have to pay extra to get lettuce and a tomato on your burger. Sliders has a much better condiment bar, but Super Duper's actually hamburgers are much better -- for burger joints, surpassed in the Castro only by BurgerMeister. Some day I want to try their sundae with bacon.