first featured instructable for me, Thanks!
For tips on Cast-iron cookware, go here.
Update: When making burgers like this it is pretty important to keep them all uniform in shape and thickness.
To make sure they are all the same thickness head on down to your local hardware store and purchase 2 dowels (square dowels work the best)
and then head to walmart or your local supermarket and pick up some wax paper,a long rolling pin, and one of them roll type pizza cutters.
Set your dowels down on your counter at about the max width of your rolling pin. and then place one long piece of wax paper between and over your dowels. toss your beaten meat in between the dowels and on top of that wax paper ( try and spread it out a little so its not one giant beaten meat pile in the middle) toss another piece of wax paper over the top. get out the trusty rolling pin and start rolling making sure that the rolling pin stays on top of the dowels as you roll you may need to adjust the top piece of wax paper. you should wind up with a big somewhat square sheet of beaten meat, now all you need to do is peel off the top wax paper, slide the dowels out and run your pizza cutter across your meat in straight lines(forming squares) and you are ready to hit the frying pan!