
Layer III of Le Big Mac: Pickle horizon. Gherkins, eaten in India with salt or lemon juice for 3,000 years, came to Europe during the Renaissance. Along with their crunchy texture, pickles add a primary sour taste which has been enjoyed with lettuce since the Roman era.

Layers VI & XII of Le Big Mac: Sauce. Sauce adds moisture, required for the tongue to taste chemicals in solution. Sweet and sour sauces have flavored meats for thousands of years, and the Big Mac uses a variant of thousand-island dressing (made from salad oil, orange and lemon juice, minced onion, paprika, Worcestershire sauce (a spicy Indian recipe), dry mustard, parsley, and salt). The nonverbal secret of a Big Mac is the riddle of its sauce.