Eating at Wolfgang Puck's restaurants can be a real headache -- just ask a woman who says she was dining at one of Wolfgang's D.C. locations ... when a waitress smashed her in the head with a pitcher ... and now she's suing the famous chef.
Tamara Mason-Williams filed the lawsuit in L.A. County Superior Court, claiming she was eating at Wolfgang's The Source Restaurant back in April ... when a waitress walloped her dome with a "heavy metal water pitcher."
Tamara says the incident left her with a nasty concussion -- and Wolfgang's restaurant is 100 percent to blame because of its "negligently trained" staff.
She's now suing for an unspecified amount in damages for lost income and medical expenses.
We reached out to Wolfgang for comment -- so far, no word back.