Using porterhouse steak makes this stroganoff very tender and tastey...you could use another cut if it is on sale with very similar results. If it is a fairly cheap cut of meat, marinate it for 1 hour in the refrigerator with 1 tbsp vinegar, 1 tsp salt and enough water to cover. This will tenderize the meat. It is best to slice the meat while partially frozen, and slice it diagonally across the grain to make the meat more tender and also make it look larger in the dish! To make this more economical, use ground beef, but be sure to drain the grease from the pan! Note: Prep time does not include marinating a less tender cut of beef!