Cook cauliflower in boiling salted water; drain, reserving liquid.
Melt butter. Add onion and cook until soft. Blend in flour; add broth, and cook, stirring constantly, until mixture comes to a boil. Stir in 1 c. liquid drained from cauliflower (adding water if necessary to make 1 c.), cream, Worcestershire sauce and salt. Add cauliflower. Heat to boiling. Stir i