Betamax

Betamax belongs to the family of grilled offal and odds-and-ends sold by Filipino street vendors, a nose-to-tail thrift that turns animal blood — a byproduct of slaughter — into a cheap snack. The name is a piece of pop-culture wordplay from the era when the Betamax tape was common, the dark squares of set blood echoing the cassette's shape. Like its cart-mates isaw, adidas, and helmet, its exact origin is undocumented; it is firmly an everyday people's food born of using every part of the pig.

The texture is the surprise: firm yet tender, like a savory set custard or a soft tofu, yielding cleanly to the bite. Grilling lends a smoky char and a slight crust to the edges, while the inside stays soft. The flavor is mild, savory, and faintly mineral-iron; the spiced vinegar with chili and garlic is what lifts it, cutting through with sourness and heat. It is far gentler than its dark looks suggest.

Liquid blood sets into a solid because its proteins coagulate when heated, much as egg sets — the blood is boiled or steamed until firm, then cut into uniform cubes that hold on a skewer. Marinating seasons the bland surface, and grilling over coals drives off surface moisture, browns the edges through the Maillard reaction, and adds smoke. The block must be set firm before grilling or it crumbles off the stick; gentle heat keeps the interior from turning dry and crumbly.