Big Twin Sauce is a condiment featured by the Hardee's and Carl's Jr. restaurant chain.
[3] Americans have a longstanding history of being drawn to the flavor combination of Thousand Island dressing on a double cheeseburger.
[4] Standard cheeseburger condiments include ketchup, barbecue sauce, mayonnaise, relish, mustard, and also Thousand Island dressing.
Many fast food restaurants feature a similar style sauce.
This includes Wendy's, Sonic Drive-In, Burger King, and Arby's.