Customer takes McDonald's, Wendy's beef to court

STORY: Justin Chimienti thought his Big Mac and Bourbon Bacon Cheeseburger were not as big and juicy as advertized

Now he is suing McDonald's and Wendy's in a Brooklyn federal court

Chimienti accuses the fast-food chains of defrauding customers with their marketing

He says they use undercooked beef patties in ads, making them appear 15% to 20% larger

The complaint quotes a food stylist who's worked for the chains and says she prefers using undercooked patties

McDonald's and Wendy's did not immediately respond to Reuters' requests for comment

The class action is similar to a Miami lawsuit against Burger King, which is yet to respond formally