The California burrito is a San Diego build defined by one component most burritos would never let inside: french fries. Carne asada, grilled and chopped, goes in alongside cheese, guacamole, and sour cream, and then the fries go in with it, not on the side. The fries are the essential and distinctive fact of this burrito, and the build is engineered around them. The starch absorbs the rendered juices of the carne asada and the moisture of the guacamole and sour cream, which would otherwise soak the tortilla, while taking on the char and salt of the beef. The carne asada gives the fries a savory, smoky reason to be there; the fries give the burrito a soft-and-crisp interior contrast a rice-and-bean core does not. Remove the fries and it is simply a carne asada burrito. With them it is a different thing, the two parts built to need each other.
Made well, this is a study in timing. The carne asada is grilled hot, rested briefly, and chopped so its juices and char are evenly distributed rather than arriving in one bite. The fries go in still hot and reasonably crisp, because fries added cold or limp turn to mush and lose the textural job that justifies them. Guacamole and sour cream are added with restraint, enough for richness and cooling but not so much that the wrap floods, since the fries can only absorb so much before they collapse. The tortilla is a large flour round warmed until pliable, the filling laid in a tight line down the center, the sides folded, the cylinder rolled firm and closed. A clean build holds a cohesive core where the fries still have some bite; a sloppy one overfills the wrap, drowns the fries in crema, and tears at the first bite. It is a handheld burrito, meant to eat cleanly on the move, which is part of why the absorbent starch matters.
Pull the fries and you have the plain carne asada burrito, leaner and simpler, which deserves its own article rather than being crowded in here. Swap them for tater tots and the result is the regional tot variation found around Southern California, which deserves its own article rather than being crowded in here. Add rice, beans, salsa, and the full lineup and you slide into the Mission-style burrito, a larger and differently balanced build that deserves its own article rather than being crowded in here.