For those of you who are familiar with Steak N Shake~~?

get ground sirloin and get it very cold but not frozen put it between wax paper and flatten it out very thin ,take one side off lay it in the pan then take that paper off,cook on very high heat in an iron skillet

Use ground beef, but before you grill you are going to add egg to the beef and mix it together. This will hold the beef together so that you can form a thin patty that will not fall apart.

Start with a ball of beef and egg that is loose and place on flat hot cooking surface with lots of oil. Then using a flat pancake flipper with no slots, flatten to a patty. The reason that you flatten while cooking is that the egg will cook right when it hits the pan, and that will be what keeps it together.

Other than that I would not begin to tell you how to season it. I have no idea on that.

This is my favorite "fast food" place. I've sat at the counter and watched them cook (really - I wasn't flirting with the guy) and they start with a fairly thin patty and as it cooks they flatten it with a spatula. If I did it that way, I'll squeeze all the juicy out of it.

I don't really know HOW they do it, just as long as they continue to do it well.

use ground sirlion, flatten it , grill on flat surface.