The dish's signature creamy texture traditionally comes from mashed pig's brain stirred through the meat — not mayonnaise, which only became a common substitute in modern versions.
Grilled or boiled pig face, ears, and snout are chopped into larger pieces than its Kapampangan cousin sisig, then tossed with vinegar, calamansi, onions, and chili, bound with mashed pig brain for richness. Ilocano stalls sell it as a pulutan to go with drinks or plain rice.