Cut the steak into bite sized pieces. Turn the heat up (higher heat is good!) and add the steak to the butter in the skillet. Let the steak sit in the pan for about a minute without stirring – this helps it get a nice sear on one side, like you see in the picture. Flip the steak pieces and cook for another minute or two, until both sides are well-seared. This should only take 2-3 minutes – because of the size of the steak pieces, you really only need to sear the outside and the insides will continue to cook just enough once you remove from the pan.