When it comes to bao buns, a multitude of delicious sauces can be used to enhance the flavor. However, deciding which sauce is the best can be difficult. In general, the best sauce for bao buns will be one that complements the flavors of the fillings.  If the buns are filled with spicy pork, a sweet and tangy sauce would be a good option; that is Hoisin Sauce. Another delicious option is sriracha sauce. This Thai chili sauce comprises chili peppers, vinegar, garlic, sugar, and salt.  It has a bold flavor that complements the sweetness of the buns.  For a traditional option, try soy sauce. This salty sauce is made from soybeans, water, and salt, bringing out the meat's savory flavors.