Strip a burrito back to its two essential elements and you have the burrito de frijoles: refried beans and a flour tortilla, nothing else required. What defines the build is how completely those two parts depend on each other. Refried beans on their own are a side dish, soft and shapeless on a plate. A flour tortilla on its own is bread waiting for a job. Folded together, the beans give the tortilla a creamy, savory, faintly smoky core, and the tortilla gives the beans structure, portability, and a toasted wheat frame. This is the baseline against which every other burrito is measured, and it survives on its own merits because the pairing is engineered to need each other.
Making it well is mostly about the beans. Pinto beans, sometimes black, cooked soft and then mashed and fried in a little fat until they thicken into a spreadable paste rather than a soup. The texture is the whole craft: too wet and the paste bleeds into the tortilla and the wrap goes slack; too dry and it crumbles and the burrito will not hold a cylinder. A good refrito holds a line when spooned. The tortilla should be a thin wheat round warmed on a comal until it is supple and slightly toasted, which deepens its flavor and makes it fold without cracking. Spread the beans in a disciplined band down the center, leave room at the edges, fold the sides in, and roll tight. Many cooks press the finished burrito seam-down on the griddle so the tortilla seals and picks up a faint crust. A sloppy version overfills the wrap or uses cold, stiff tortilla and splits at the first bite; a clean one is a tidy, even cylinder that eats the same from end to end.
Add rice alongside the beans and you have the bean and rice burrito, a heartier everyday build that deserves its own article rather than being crowded in here. Melt cheese into the beans and the result drifts toward the bean and cheese burrito, a close cousin with its own balance that deserves its own article rather than being crowded in here. Drop the same bean burrito into hot oil until the shell blisters and you reach the bean chimichanga, structurally a different animal that deserves its own article rather than being crowded in here.