Jiānbing Guǒzi (煎饼果子) is the Tianjin-style jianbing, the codified reference build of the Chinese street crepe and the version most other forms are measured against. The angle is a fixed, balanced spec rather than a loose street improvisation. A mung-bean-and-wheat batter, one or two eggs, a crisp interior, three sauces in a set role, scallion, cilantro: the Tianjin build treats these as a recipe with proportions, not a free-for-all, and its identity is that discipline. Get the spec right and it reads as a controlled stack of tender crepe, bonded egg, savory-sweet sauce, and a loud crisp core. Get it loose and it drifts into a generic street wrap with the balance gone.
The build follows the Tianjin order closely and the order is the point. A thin mung bean and wheat batter is poured onto a hot round griddle and swept into a wide, even circle. One or two eggs are cracked straight onto the wet surface and smeared flat so they set into the crepe. The disc is loosened and turned, then painted with three sauces in their defined roles: a sweet fermented flour paste, tiánmiànjiàng, for the savory-sweet base, a fermented bean or sesame note for depth, and a chili sauce for heat. Chopped scallion and cilantro are scattered across it. The crisp interior goes in next, either a length of fried dough stick, yóutiáo, for a chewy, breadier core, or a thin deep-fried cracker, báocuì, for a shattering one, and the crepe is folded in from the sides and ends into a hand-sized parcel. Good execution is the spec held: a crepe set through but pliable, egg fully bonded, the three sauces balanced so the sweet flour paste leads and the chili supports without burning over it, and a crisp center that is still crisp at first bite. Sloppy work shows where the spec slips: batter too thick and gummy at the center, sauces out of proportion so the wrap reads only sweet or only hot, a yóutiáo fried ahead and gone leathery, or a fold so loose it spills.
It shifts mostly by the count of eggs and the choice of crisp interior, the two axes the Tianjin build leaves open. A double-egg version pushes richness; swapping yóutiáo for báocuì trades a chewy core for a brittle one; a heavier chili hand or an added slice of ham each defines its own named variant off this base. Those one-change variants, and the báocuì and yóutiáo as components in their own right, each deserve their own treatment rather than being crowded in here, while this entry holds the reference build itself and the proportion discipline that defines the Tianjin style.