The popular Mexican fast food restaurant chain Del Taco makes a creamy white condiment that is known as its secret sauce. Del Taco's secret sauce is made with a combination of soybean oil, vinegar, egg yolk and buttermilk solids.
Fans of the Del Taco chicken taco enjoy it with the traditional creamy white secret sauce. Due to its secret nature, there is no official recipe for this savory sauce.
Customers who crave more secret sauce can have it added to any menu item when they utter the code words "go bold" while placing an order. This special perk is not advertised on the menu, so customers often need to verify this offer by asking Del Taco staff.