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  1. 4 hours ago · Jack in the Box lists just one ingredient for the "Beef Hamburger Patty, Jumbo and Regular," used in its smaller sandwiches: beef. The "Beef Patty, ¼ lb. Signature" style, employed in the preparation of some of Jack in the Box's larger and more premium sandwiches, is mostly beef, as well as a number of fillers and flavor enhancers.

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