Brown and crumble the ground beef in a heavy skillet
over medium heat. Add the onion and garlic as soon
as there's a little grease in the bottom of the pan,
and cook until all pinkness is gone from the ground
beef.
Drain the excess grease. Add the mushrooms,
broth concentrate, Worcestershire, and paprika. Stir
in the sour cream, then add salt and pepper to
taste. Heat through, but don't let it boil.