Kakuni Braised Pork Belly Soy-Mirin Method

Origin

Japan (Nagasaki Chinese-influenced origin; nationwide adoption; Okinawa rafute is a related variant with awamori)

Description

Kakuni (角煮, 'square simmered') is the Japanese approach to braised pork belly — thick blocks of pork belly (3–4cm cubes) simmered for 2–3 hours in sake, soy sauce, mirin, and sugar until the collagen converts to gelatin, the fat becomes translucent and tender, and the whole block trembles with a yielding richness that has become one of the defining textures of Japanese comfort food. The name refers to the characteristic square cut. The method requires initial par-boiling to remove impurities (for 10 minutes with leek and ginger), a rest period, then a long simmer in the braising liquid. Ideally, kakuni is made a day ahead and chilled — the congealed fat layer is removed, and the pork reheated in the reduced sauce which, by then, has achieved a concentrated sweet-soy glaze quality. Simmering in a liquid that starts with sake and mirin burned off before soy is added prevents the harsh alcohol edge that raw sake addition can impart. Nagasaki's Buta no Kakuni (with Chinese-influenced ryukyu-style) uses rice wine, a technique imported from Chinese braised pork traditions, while Tokyo-style uses standard sake and domestic soy. Served with hard-boiled eggs simmered in the same liquid (umani tamago) and blanched spinach with sesame.

The Thread

• Direct cultural ancestor — Chinese red-braised pork belly with soy and rice wine is the origin of Japanese kakuni preparation → Hong shao rou (red-braised pork, Mao's pork) Chinese
• Both use long, low-temperature braise with sweet-savoury liquid to convert collagen to gelatin and achieve meltingly tender pork belly → Poitrine de porc confite braised pork belly French

Flavour Context

Sweet, soy-caramelised, richly gelatinous pork with trembling fat; deep mirin sweetness; concentrated glaze coats each cube; pairs with white rice and mustard

Key Principles

Initial par-boil 10 minutes with leek and ginger: removes impurities and off-odours before braising

Burn off sake and mirin before adding soy — prevents harsh alcohol note in finished dish

3-hour minimum simmer at barely-simmering temperature — rolling boil makes tough

Chill overnight: remove solidified surface fat; flavours deepen; reheating concentrates glaze

Otoshibuta (drop lid) essential for even cooking without total submersion in liquid

Pro Tips

{"Baking paper as makeshift otoshibuta: cut to fit the pot interior and rest directly on liquid surface","Add a small amount of rice vinegar to the braising liquid — tenderises collagen faster and balances sweetness","Pressure cooker shortcut: 25–30 minutes at full pressure achieves similar collagen conversion as 3-hour simmer","Kakuni sandwich (nikuman adaptation): slice chilled kakuni thin, place in steamed bao bun with pickled mustard greens"}

Common Mistakes

Skipping the par-boil step — impurities and off-flavours remain in the final braising liquid

Boiling rather than barely simmering — collagen converts but meat becomes fibrous rather than silky

Not resting overnight — day-of kakuni lacks the concentrated glaze and depth of next-day version

Adding soy from the start without burning alcohol first — harsh alcohol edge persists

Source

Japanese Cooking: A Simple Art — Shizuo Tsuji; The Japanese Kitchen — Hiroko Shimbo