Big Twin Sauce is a condiment

Condiment

A condiment is an edible substance, such as sauce or seasoning, added to food to impart a particular flavor, enhance its flavor, or in some cultures, to complement the dish. Many condiments are available packaged in single-serving sachets , like mustard or ketchup, particularly when supplied with...

 featured by the Hardee's

Hardee's

Hardee's is a restaurant chain, located mostly in the Southeast and Midwestern regions of the United States. It has evolved through several corporate ownerships since its establishment in 1960. It is currently owned and operated by CKE Restaurants. Along with its sibling restaurant chain, Carl's...

 and Carl's Jr.

Carl's Jr.

Carl's Jr. is an American fast-food restaurant chain located mostly in the Western and Southwestern United States. The first store has opened in Canada in Kelowna, BC. They are in the process of expanding to Mexico, Malaysia, Denmark, Costa Rica, New Zealand, Australia, Singapore, Russia, Vietnam,...

 restaurant chain. The sauce is comparable in taste to Thousand Island dressing

Thousand Island dressing

Thousand Island dressing is a salad dressing and condiment, a variant of remoulade and Russian dressing.Its base commonly contains mayonnaise and can include olive oil, lemon juice, orange juice, paprika, Worcestershire sauce, mustard, vinegar, cream, chili sauce, tomato puree, ketchup, or Tabasco...

. The sauce is featured in Hardee's Big Hardee

Big Hardee

The Big Hardee is a hamburger sandwich offered by Hardee's. The original Big Hardee was introduced in 1995 and was designed to compete against McDonald's Big Mac or Burger King's Whopper....

 sandwich and Carl's Jr. Big Carl. Although the exact composition of the sauce is a trade-secret, its likely ingredients include mayonaise, eggs

Egg (food)

Eggs are laid by females of many different species, including birds, reptiles, amphibians, and fish, and have probably been eaten by mankind for millennia. Bird and reptile eggs consist of a protective eggshell, albumen , and vitellus , contained within various thin membranes...

, pickles

Pickled cucumber

A pickled cucumber is a cucumber that has been pickled in a brine, vinegar, or other solution and left to ferment for a period of time, by either immersing the cucumbers in an acidic solution or through souring by lacto-fermentation.-Gherkin:A gherkin is not only...

, green onions

Scallion

Scallions , are the edible plants of various Allium species, all of which are "onion-like", having hollow green leaves and lacking a fully developed root bulb.-Etymology:The words...

, salt

Salt

In chemistry, salts are ionic compounds that result from the neutralization reaction of an acid and a base. They are composed of cations and anions so that the product is electrically neutral...

 and pepper

Black pepper

Black pepper is a flowering vine in the family Piperaceae, cultivated for its fruit, which is usually dried and used as a spice and seasoning. The fruit, known as a peppercorn when dried, is approximately in diameter, dark red when fully mature, and, like all drupes, contains a single seed...

 and chili sauce

Chili sauce

Chili sauce is a condiment, similar to ketchup but with onion, garlic, and spice. Despite its name, it does not contain chili peppers and thus is not hot....

. It is comparable to McDonald's own special sauce, first released in 1975.

Americans have a longstanding history of being drawn to the flavor combination of Thousand Island dressing on a double cheeseburger

Cheeseburger

A cheeseburger is a hamburger with cheese that has been added to it. Traditionally, the cheese is placed on top of the patty, but the burger can include many variations in structure, ingredients, and composition...

. Standard cheeseburger condiments include ketchup

Ketchup

Ketchup is a sweet-and-tangy condiment typically made from tomatoes, vinegar, sugar or high-fructose corn syrup and an assortment of...

, barbecue sauce

Barbecue sauce

Barbecue sauce is a flavoring sauce or condiment ranging from watery to very thick consistency. As the name implies, it was created as an accompaniment to barbecued foods. While it can be applied to any food, it usually tops meat after cooking or during barbecuing, grilling, or baking...

, mayonnaise

Mayonnaise

Mayonnaise, , often abbreviated as mayo, is a sauce. It is a stable emulsion of oil, egg yolk and either vinegar or lemon juice, with many options for embellishment with other herbs and spices. Lecithin in the egg yolk is the emulsifier. Mayonnaise varies in color but is often white, cream, or pale...

, relish

Relish

A relish is a cooked, pickled, or chopped vegetable or fruit food item which is typically used as a condiment.In North America, relish commonly alludes to sweet pickle relish-like sauce that often condiments hot dogs, hamburgers and other types of fast food.-Description and ingredients:The item...

, mustard

Mustard (condiment)

Mustard is a condiment made from the seeds of a mustard plant...

, and also Thousand Island dressing.

Many fast food restaurants feature a similar style sauce. This includes Wendy's

Wendy's

Wendy's is an international fast food chain restaurant founded by Dave Thomas on November 15, 1969, in Columbus, Ohio, United States. The company decided to move its headquarters to Dublin, Ohio, on January 29, 2006. It has been owned by Triarc since 2008...

, Sonic Drive In, Burger King

Burger King

Burger King, often abbreviated as BK, is a global chain of hamburger fast food restaurants headquartered in unincorporated Miami-Dade County, Florida, United States. The company began in 1953 as Insta-Burger King, a Jacksonville, Florida-based restaurant chain...

, and Arbys.