The crust's bright orange color has nothing to do with the filling — it comes from annatto seeds worked into the rice-flour dough itself, before anything is even wrapped inside.
A thin, rice-flour dough tinted orange with annatto is filled with grated green papaya, egg, and a piece of Vigan longganisa, folded shut, and deep-fried to order in a wide wok. Vigan's Plaza Burgos food stalls fry them fresh as diners wait, handing them over piping hot on a paper plate.