Sawsawan is the Filipino word for dipping sauce or gravy. The most famous Sawsawan are: Toyo (Soy sauce) and Kalamansi (Philippine native lime) with chopped siling labuyo (red chili peppers); Patis (fish sauce) and Kalamansi or just plain Patis; chopped kamatis (tomatoes), sibuyas (onions) and luya (ginger) with a bit of Suka (vinegar) and salt.
For the Lechon, there is a special sauce made from liver and always given free when buying Lechon from Lechon makers. A famous brand of this liver gravy is called Mang Thomas which are available in bottles in almost all supermarkets in the Philippines.
List of books: Sawsawan