If you've never heard of it, sisig is a dish traditionally made with pork parts (often the head and liver), onions, chiles, and egg.
Bourdain describes it as "sizzling, crispy, sticky, delicious bits of pork with many textures."
If you're interested in more Filipino food, Bourdain names adobo (meat, veggies, or seafood marinated in vinegar, soy sauce, and garlic) and sinigang (sweet & sour soup) as other favorites of his.