The product name comes from its unique toppings: five pickles, three onion rings and topped with pepper sauce on two beef patties with cheese.
"For more than 60 years, the Whataburger has remained unchanged,” said Rich Scheffler, Whataburger Restaurants LP group director of marketing. “By adding our crispy onion rings, we can provide our guests with the same Whataburger taste they know and love with one of our most popular sides. Our all new 5-3-1 Burger is a true original and unlike anything we have done before."