♦ Sauté beef and onion in butter until meat is crumbly, stirring frequently.
♦ Add mushrooms and cook until mushrooms are tender, stirring often.
♦ Drain off any fat; stir in flour and salt. Add sour cream, parsley, dill weed
and Worcestershire sauce. Simmer, stirring constantly, until sauce is thickened.
♦ Cover, set aside and allow to cool while preparing pastry.