Japanese Kakuni Braised Pork Belly Shoyu and Sake Method

Kakuni (角煮, 'square simmered') is Japan's canonical braised pork belly preparation — thick squares of pork belly (skin-on, approximately 4×4cm blocks) slow-cooked in sake, soy sauce, mirin, and sugar until the pork reaches complete softness and the sauce becomes a thick, glossy reduction. The Chinese influence is direct: kakuni is considered a Japanese adaptation of Chinese red-braised pork (dongpo pork), and the name references the square cut of the pork pieces. Unlike the Okinawan rafute (which uses awamori and brown sugar), mainland kakuni uses sake and white or brown sugar with a typically stronger soy component. Production sequence: the pork belly slab is cooked whole in plain water first for 60–90 minutes (pre-cooking stage removes excess fat and firms the protein structure for cleaner final braising); the cooked whole slab is cooled and cut into precise squares; the squares are then braised in the final sauce over very low heat for 60–90 additional minutes. This two-stage cooking achieves: maximum fat rendering without over-drying the lean protein; clean, unmuddled braising liquid that concentrates into a pure glossy sauce. The fat in properly made kakuni is gelatinous and barely solid — almost liquid at body temperature. Garnish: a piece of soft-boiled or simmered egg (kakuni tamago), mustard (karashi) at table, blanched bok choy or spinach for colour and freshness.