Lindsay Lohan -- Grilled Like a Cheeseburger

Sources tell TMZ lawyers for the people suing Lindsay Lohan have been "giving her a hard time" during the deposition -- going over the alcohol-fueled wild ride down Pacific Coast Highway in 2007.

We're told Lindsay has been "cooperative," but the plaintiffs' lawyers have taken the gloves off.

So far Lindsay has not buckled. They're finishing off a lunch break.

Anything can happen, so ...