sentences:  The hope is that the customers would be drawn in initially for the lower prices of the value-menu and upgrade to the more expensive products, upping overall sales.The chain's first major attempt was part of their Specialty Sandwich line that was introduced in 1979 was the Sirloin Steak Sandwich.After the failure of the Specialty Sandwich line, Burger King went on to introduce several other premium burgers made from a variety of meats.