Ladies and Gentlemen: If you have really good lechon, the correct amount of Mang Tomas (or any other sarsa) to use for lechon paksiw is zero. Vinegar and spices are enough.
The amount of Mang Tomas to use is inversely proportional to the quality of lechon, ie, the poorer the lechon quality, the more Mang Tomas you use. Thank you.