Starting today through Sunday, Jack in the Box restaurants in Hawaii — except the Hilo location — are offering a free mini sirloin burger to anyone mentioning the challenge. There's a limit of one burger per individual.

The new Mini Sirloin Burgers are a trio of all-sirloin patties, which are seasoned while cooking, topped with American cheese, grilled onions and ketchup, and served on small, bakery-style buns reminiscent of Hawaiian sweet rolls.

There are 26 Jack in the Box restaurants in Hawaii, and 2,170 total in 18 states.

For more information, visit www.jackinthebox.com.