<human>:  How can I make a beef stroganoff from scratch?
<bot>: 
1. Start by slicing a pound of beef into thin strips.
2. Once the beef is cooked, remove it from the pan and reduce the heat to medium.
3. Return the beef to the pan and add one cup of beef broth, one tablespoon of tomato paste and one teaspoon of Worcestershire sauce.
4. Finally, stir in one-half cup of sour cream and one-half cup of mushrooms.