If you have left over cooked roast and dont know what to do with it, here is a nice little recipe I found in Taste of Home. I like to add a few tablespoons of sour cream just before serving, but it is up to you.
Each year we buy beef (in large quantities) from a local farm. This means I have a ton of hamburger that I struggle to use up! When I make this stroganoff recipe I always make a double batch and freeze the extras for the husban.