This was fabulous! Using the supercook.com site, I found this recipe on the presumption that I had ground beef in the freezer; however, I did not but I had some beef. I put the rather tough cut of beef in the pressure cooker with some beef broth and cooked it for about an hour. It fell apart and was perfect for a substitute for the ground beef. And as a true Southerner, I decided we needed some gravy for the piroshki. Using the pan I prepared the potato/onion/bacon mixture, I deglazed the pan with a little butter, flour, marsala and added all (about 8 cups) of the beef broth from my "pressure cooker"ed beef and made a kind of thickened au jus for dipping the piroshki. It was an ideal combination!
Delicious and fun. trust me.