Làzhīròu Jiāmó (Pork) is the pork rendition of the Xi'an roujiamo, the standard and most common filling, in which fatty pork belly and lean meat are braised together in the spiced làzhī master stock, then chopped and packed into a freshly baked mó. The angle is the deliberate mix of fat and lean. Belly alone would be too soft and rich, lean alone too dry and tight; braised and chopped together they give a filling that is tender, glossy, and self-lubricating, the rendered fat carrying the spice through every piece of lean. The braise does the seasoning and the mó is the shell that keeps it portable.
The build is a split-and-fill with both halves made apart. Belly and a leaner cut go into the làzhī together, a long-running aromatic stock of star anise, cinnamon, fennel, Sichuan peppercorn, ginger, and cooking wine, and simmer slowly until the fat is soft and the lean pulls apart. The meat is lifted, drained a little, and chopped on a board so the fat and lean fold into one another in juicy pieces rather than separating into a fatty slick and dry threads. The mó is a low-leavened wheat bun with a firm crust and a soft layered crumb, baked so the outside is crisp and the inside stays tender. The hot bread is slit and the warm chopped pork tucked in with a spoonful of reduced braise. Good execution is judged on the fat-to-lean read and the moisture: the chop should be rich but not greasy, the lean tender rather than stringy, the bread crisp-shelled and soaking only a little of the liquor. The failure modes are clear. Too much belly and the filling turns to a heavy fatty paste that slides out; too lean a mix and it eats dry and tight no matter the spice; an under-baked mó goes gummy and flattens under the meat; flooding it with loose stock soaks the base and the sandwich falls apart in the hand.
It shifts mostly by the ratio of fat to lean and by the spice balance of the braise. A belly-forward chop is softer and more lavish; a leaner blend is cleaner and firmer but wants more stock spooned through to stay moist. Some kitchens lean the làzhī toward more Sichuan peppercorn for a brighter, faintly numbing finish, others toward rounder, sweeter aromatics for a mellow read. Fresh chili or coriander inside is the usual cutting note against the richness. The cumin-lamb roujiamo and the donkey-meat fillings are separate preparations built on different meats and logics and deserve their own articles rather than being treated as variants here. What holds the pork version together is the braised belly-and-lean mix itself, chopped so fat and lean carry the master-stock spice into a crisp, soft-cored wheat bun.