Cheese-Sour Cream Fondue

6 slices bacon
1/4 c. chopped onion
2 tsp. flour
1 lb. cheese (4 c. shredded)
2 c. sour cream
1 tsp. Worcestershire sauce
Fry bacon; drain, reserving 1 T of drippings. Crumble bacon and set aside. Cook onions in reserved drippings until tender, not brown. Stir in flour. Add remaining ingredients. Cook over low heat until cheese is melted. Top with bacon.