With every purchase of an appetizer, what must be offered?

When an appetizer is ordered at Panda Express, it is standard procedure to offer Sweet and Sour Sauce with every purchase. This practice is rooted in providing an enhanced dining experience by complementing the flavors of the appetizers. Sweet and Sour Sauce is a popular choice that appeals to many customers due to its tangy and slightly sweet flavor profile, making it a fitting accompaniment.

The other sauces listed serve particular dishes or have specific pairings, but they do not have the same universal association with the appetizers as Sweet and Sour Sauce does. This ensures that customers can enjoy their appetizers with a sauce that harmonizes well with a variety of flavors.