The BLT-style onigirazu takes a Western deli triangle and rebuilds it with rice where the toast used to be. Bacon, lettuce, tomato: the trio is intact and instantly legible, but the bread is gone, replaced by two bands of seasoned short-grain rice and a square of nori doing the wrapping. It is a fusion in the literal sense, a familiar flavor set forced through an unfamiliar frame, and the interest is entirely in whether the rice can carry a combination built for crusty bread.
Assembly follows the format exactly. Nori on the diagonal, a flat bed of rice, the filling laid in level sheets, a second even rice layer, corners folded to a sealed packet, a rest seam-side down, a clean cut to expose the stripe. The bacon is cooked crisp and usually blotted hard, because rendered fat soaks into rice and turns the band greasy and grey instead of crisp and red. The lettuce is a structural choice as much as a flavor one: a crisp leaf adds the snap a bread BLT gets from toast, and many builds line the rice with it so the rice never touches the wet tomato directly. The tomato is the recurring problem. Sliced thin, seeded, salted and drained on paper before it goes anywhere near the packet, it gives bright acidity; left juicy and unsalted it weeps into the rice within minutes and softens the whole structure into something that smears at the cut. A swipe of mayonnaise, often loosened with a little mustard or pepper, ties the three together exactly as it does in the original.
The faults here are mostly moisture management, which is the defining tension of the version. A bread BLT tolerates a wet tomato because toast resists for a while; rice does not, so the BLT-style onigirazu punishes anyone who skips the draining step. Crisp bacon laid flat slices cleanly into a defined dark band; bacon piled in a clump bulges the nori, tears it, and leaves the corners empty. The lettuce wants to be folded or layered, not bunched, or it springs the packet apart at the cut. Done with care the cross-section is genuinely striking: red rim of bacon, green of lettuce, pale tomato, all set in white rice and ringed by black nori.
Variations push it further from the source: avocado worked in for a California turn, a fried or jammy egg for body, teriyaki-glazed bacon leaning back toward Japanese flavor, lettuce swapped for shiso to bridge the two cuisines. Each of those is a different balance question and deserves its own article rather than being crowded in here.