OAK BROOK Ill. The premium burger wars are escalating as McDonald’s expands its Angus beef burger test March 5 to 600 southern California restaurants. Simultaneously, San Diego-based Jack in the Box has started testing a 100-percent sirloin burger in its home market. Both chains are following the lead of Carl’s Jr. and Burger King, both of which debuted Angus burgers in 2004.
McDonald’s test units will sell its six-ounce Angus Third Pounder burgers on a new