Any doctor 'worth her salt' [=any good/capable doctor] would have advised you to get a second opinion before having major surgery.
A detective writer 'worth his salt' [=a good detective writer] keeps his readers from solving the mystery.
The book is 'salted with' witty anecdotes. [=the book has many witty anecdotes throughout it]
(..) The nearby one? Right down the street. Spring Which street? What's your fiance’s name? Sam. What does he do? S-S-Salt. Salt? Sea... salt. Sea salt. He's a salt seaman. He- He dives in to the ocean for the sea salt. And then he brings it back up. (..)2009 TvShow: It's Always Sunny in Philadelphia Title: The Waitress Is Getting Married Season: 5 Episode 5