P
Japanese · Nagasaki
Kakuni Japanese Braised Pork Belly Slow Simmering
Kakuni (角煮, 'square simmered') is Japanese braised pork belly — thick blocks of skin-on pork belly simmered for 2–3 hours in a master broth of dashi, sake, mirin, soy sauce, and sugar until the fat is gelatinised, the skin is trembling and silky, and the meat is fork-tender. The name refers to the square-cut block presentation. Unlike Chinese dongpo rou (which it resembles), Japanese kakuni uses lighter seasoning, often adding kombu or dried shiitake for dashi depth, and may include a preliminary blanching in rice-washing water (kome no togi-jiru) to remove impurities. Nagasaki kakuni, particularly influenced by Chinese trading communities in Nagasaki, is considered the most refined regional variation.
I
The Market List
The benchmark for each ingredient, and who stocks it near you. Tap a stockist to go straight to the product.
1.2 kg
skin-on pork belly
cut into 6–7 cm square blocks
Your own market
1 litre
dashi
kombu and dried shiitake preferred for depth
Not yet stocked in British Columbia
250 ml
sake
Not yet stocked in British Columbia
250 ml
mirin
Not yet stocked in British Columbia
250 ml
2 tbsp
sugar
added in stages, to taste
Your own market
For blanching
2 litres
rice-washing water (kome no togi-jiru)
or plain water if unavailable
Not yet stocked in British Columbia
To serve
1 tsp
karashi
Japanese hot mustard, prepared
Not yet stocked in British Columbia
100 g
negi
blanched and cut into 5 cm lengths
Not yet stocked in British Columbia
Each tap is counted, so the stockist sees the demand Provenance sends them.
II
The Method
1
Place the pork belly blocks in a pot with the rice-washing water. Bring to a boil and blanch for 10 minutes. Drain, rinse each block under cold running water, and pat dry. The surface should be clean and free of grey scum.
2
Combine the dashi, sake, and mirin in a heavy pot or donabe. Bring to a gentle simmer. Add the pork blocks skin-side down. Lay an otoshibuta (drop lid) directly on the surface of the liquid. Maintain the heat at a bare simmer — 80–85 °C — for 1 hour. No bubbles should break the surface vigorously; a slow, occasional rise indicates the correct temperature.
From the canon — The donabe (clay/earthenware pot) is one of Japan's most ancient and most currently celebrated cooking vessels — experiencing a significant renaissance drive… Donabe — Clay Pot Cooking Traditions →
3
This is where the dish lives or dies: the braise must never boil. Add half the soy sauce and half the sugar. Replace the otoshibuta and continue to simmer at 80–85 °C for a further 30 minutes. Add the remaining soy sauce and sugar. Simmer for a final 30 minutes. A chopstick or skewer inserted into the thickest part of a block should meet no resistance, and the fat layer should appear translucent and trembling.
4
Remove the pot from heat. Allow the pork to cool in its braising liquid, then refrigerate overnight. The fat will rise and solidify on the surface; skim and discard it. The braising liquid will have set to a loose jelly — this is the sign of full collagen conversion.
5
Lift the pork blocks from the braising liquid. Transfer the liquid to a wide pan and reduce over medium heat until it reaches a sticky, glossy consistency that coats the back of a spoon. Return the pork blocks to the pan and baste continuously over medium heat, turning each block, until every surface carries a mahogany-coloured lacquer. The glaze should be fragrant, deeply sweet-savoury, and cling without pooling.
6
Arrange one or two blocks per portion in a shallow bowl. Spoon remaining glaze over each block. Place blanched negi alongside and a small mound of karashi to one side. Serve immediately while the glaze is still glossy.
III
Quality Hierarchy
01
Reserve — Heritage-breed skin-on pork belly (Berkshire or equivalent) with a pronounced fat-to-meat ratio; hand-made dashi from first-press kombu and whole dried shiitake; aged tamari-style soy sauce; genuine hon-mirin (not aji-mirin).
02
Estate — Butcher-sourced skin-on pork belly with good fat layering; dashi made from quality kombu and katsuobushi; a reputable Japanese soy sauce; hon-mirin. Overnight rest in braising liquid observed without exception.
03
Market — Supermarket skin-on pork belly with uniform fat layers; dashi from kombu and bonito flakes; standard Japanese soy sauce; hon-mirin. Pre-blanching and staged seasoning still strictly observed.
04
House — Skin-on pork belly from any reliable source; instant dashi (dashi-no-moto) dissolved to packet instruction; regular soy sauce; aji-mirin. The temperature discipline and overnight rest remain the minimum standard regardless of ingredient grade.
IV
Sensory Tests
◇Sight. After blanching, the surface of each pork block is clean and pale, with no grey foam or blood residue remaining.
◇Sight. During the braise, the liquid shows only the slowest, most infrequent movement — no rolling boil, no rapid bubbling.
◇Touch. A skewer or chopstick inserted into the thickest block meets no resistance; the fat layer is visibly translucent and yields when pressed lightly.
◇Sight. After overnight refrigeration, the braising liquid has set to a trembling jelly, confirming full collagen conversion.
◇Sight. The finished glaze is mahogany in colour, glossy, and clings to each block without running or pooling at the base.
◇Where it lives or dies. The braise must never exceed a bare simmer of 80–85 °C — a vigorous boil contracts the collagen before it can convert to gelatin, producing meat that is tough and dry rather than trembling and yielding.
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VI
What to Pour
The pairing
Sake
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The whole pairingPillar VII
Origin and lineage are part of membership.
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