Big Twin Sauce is a condiment featured by the Hardee's and Carl's Jr. restaurant chain. The sauce is comparable in taste to Thousand Island dressing.[1] The sauce is featured in Hardee's Big Hardee sandwich and Carl's Jr. Big Carl. Although the exact composition of the sauce is a trade-secret, its likely ingredients include mayonnaise, eggs, pickles, green onions, salt and pepper and chili sauce.[2] It is comparable to McDonald's own special sauce, first released in 1975.[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.