Costco testing Shake Shack copycat cheeseburger in Southern California

Costco’s new cheeseburger. (Photo courtesy of Foodbeast)Customers stand in line waiting to get their food at the Costco Food Court in Lakewood. ISAAC ARJONILLA, STAFF PHOTOGRAPHERAn all-beef hot dog, with a soda for $1.50. ISAAC ARJONILLA, STAFF PHOTOGRAPHERCostco’s BBQ Brisket Sandwich overflowing with beef for $4.99 ISAAC ARJONILLA, STAFF PHOTOGRAPHERFood Court manager Maria Gutierrez shows off an 18-inch Pepperoni Pizza before it goes into the oven. ISAAC ARJONILLA, STAFF PHOTOGRA