This is real Southern comfort food. The buttermilk is an unsual ingredient in gravy but it tenderizes the steak and tastes wonderful. It took me a while before I would first try this recipe because of the buttermilk, but once I did, I was hooked. The gravy doesn't "look" good until the cheese is added but don't let this fool you. This is really a delicious dish and is one that after you have it started, can be left to cook on low with minimal attention.