Flames raced through the duct work of a Burger King at 16 Beaver St., the FDNY said.
Workers from McDonald's, Burger King and other chains rallied to demand better labor conditions.
Fast food workers from Wendy's, McDonalds, and Burger King want $15 per hour and the right to unionize.
The massive, nine-inch-wide burgers are meant to be shared and will be available at the Times Square Whopper Bar in Sept.
Fast food eateries fared much better then their pricier counterparts in the city's Health Department ratings.
The victim was hospitalized and is in a wheelchair following the May 5 attack.
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