This is a great use for leftover or even canned roast beef and standard pantry/refrigerator items. The original recipe had melted butter poured over everything, but we found this to be unnecessary. There's no enchilada sauce or canned soups in this recipe and while it can be a bit time consuming, it's very, very simple. Also simply delicious! A favorite in our house since I was a very young girl. *Special note: We have been making this with low fat sour cream and cheese and heating the tortillas in the microwave to soften to cut the fat content. It turns out just fine.