In a cast iron skillet, over medium high heat, add oil. Once very hot, add half your onions. Season with salt and pepper and cook, stirring occasionally, until golden brown and translucent. Then push your onions to one side of the pan and add half of your sliced steak. Press firmly into the pan and cook for 2 minutes. Then flip and cook, stirring often, until fully brown. Mix your onion and meat together, then form into the shape of your bread. Then add your cheese and cook until melted. Place your bread on top of the meat mixture. Then, flip as shown. Repeat the same process for the second sandwich. Enjoy!
