Pork back fat and the quiet power behind Men-Eiji's gyokai-tonkotsu

When you lift the lid on a bowl of Men-Eiji ramen, the first thing that strikes you is not the broth's colour but its weight on the spoon. A slow, silken slick rides across the surface, catching the light before it melts into the liquid below. That slick is pork back fat, and in the gyokai-tonkotsu style that founder Jun Furukawa has refined across Sapporo, it works as flavour carrier, aroma lock, and texture shaper at the same time. Without it, the broth can taste impressive but feel thin; with it, the bowl becomes the kind of dish you keep thinking about long after you leave the counter.

For Australians who have fallen hard for Japanese cuisine over the last decade, the deeper layers of Sapporo ramen can still feel like a discovery waiting to happen. Sydney's ramen counters have trained local palates on shoyu and miso, but the seafood-meets-pork complexity of gyokai-tonkotsu, finished with back fat, still surprises many first-time visitors. This piece looks at what pork back fat actually does inside the bowl, how Men-Eiji handles it from raw ingredient to final garnish, and why this single component carries so much of the brand's identity.

The anatomy of back fat and its place in tonkotsu tradition

Pork back fat is the creamy layer of adipose tissue that runs along the spine of the pig, sitting just beneath the rind and above the loin. Unlike belly fat, which arrives streaked with meat, back fat is almost pure lipid, pale, pliable, and mild in flavour. That neutrality is precisely why ramen makers prize it: it has no assertive porkiness of its own, so it absorbs whatever surrounds it and amplifies it instead.

In the long lineage of Japanese noodle soups, tonkotsu broths came out of Kyushu and were defined by their heavy, emulsified pork bones boiled for many hours. Sapporo chefs later developed their own dialect, combining pork with seafood to create gyokai-tonkotsu, a richer and more aromatic register. Back fat sits on top of this broth as a final, deliberate layer. The chef scoops it into the bowl at service to give the dish a finishing viscosity and a glossy crown, ensuring that every spoonful carries both broth and fat in equal measure.

A bowl without this addition can read as watery against the deep umami of the seafood and pork bones underneath. With it, the mouthfeel rounds out, the aroma holds longer on the palate, and the noodles get a light coating that keeps them from feeling dry even as you reach the bottom. It is a small gesture at service time, but it carries the architectural weight of the whole dish.

From pig to pot: rendering and handling at Men-Eiji

Inside the Men-Eiji kitchen, the path from raw back fat to finished garnish is treated with the same care as the broth itself. Fat trimmings are checked for freshness, rinsed, and cut into manageable pieces before they meet a low, patient render. The goal is not to fry them but to coax out a clean, neutral liquid that will not muddy the broth underneath. Anything scorched or browned too aggressively would introduce bitter notes, so heat stays gentle, and the rendered fat is strained and rested until it reaches a pale ivory colour.

Once cooled, this liquid is portioned and held at a steady warmth so it stays fluid at service. At Men-Eiji Hiragishi BASE, chefs portion each bowl with a measured spoonful, calibrated to bowl size, broth concentration, and the topping selection. The same habit shapes the work at Duck Ramen EIJI, where duck replaces some of the pork bones but the back fat finish remains, balancing the leaner, gamier broth with a cooling, fatty counterweight.

Australia's own pork industry, anchored by producers in Queensland, Victoria, and South Australia, has been pushing for cleaner back-fat rendering techniques over the past decade. Many artisan butchers in Melbourne and Brisbane now separate and clarify pork fat on demand, which has made chefs curious about handling it in their own kitchens. Men-Eiji's discipline around temperature control is exactly the sort of habit Australian cooks experimenting at home would do well to borrow.

How back fat reshapes the broth's mouthfeel and aroma

Back fat's job in the bowl is partly sensory and partly chemical. Because it is mostly oil, it floats above the water-based broth, slowing evaporation and trapping volatile aroma compounds at the surface. Lifting the bowl to your face, you inhale not just steam but a denser, slower cloud of seafood sweetness and roasted pork notes. That pause between aroma and first sip is where much of the anticipation builds.

Then comes the mouthfeel. The fat coats the tongue, smoothing out sharp edges from the seafood stock and turning the dense pork collagen into something more cushioned. Noodles glide through this slightly thickened medium instead of cutting through it. Toppings like chashu, menma, and scallion take on a faint sheen rather than drying at the edges. The result feels indulgent without sliding into greasy, because the fat is neutral and the broth underneath is doing the flavour work.

There is also an umami-led reason chefs love this technique. Lipids act as a vehicle for glutamates and nucleotides, the compounds that create savoury depth. When fat carries those compounds to the taste buds, perception of richness increases dramatically, even when the actual salt level stays modest. This is why a Men-Eiji bowl can feel deeply satisfying without asking you to reach for water the way some heavier cream-based dishes do.

Pairings, layerings, and seasonal variations

Back fat rarely arrives alone. At Men-Eiji, it is part of a small toolkit of finishing fats and oils, chosen by bowl. The signature gyokai-tonkotsu leans on classic pork back fat to echo the bones below. Duck Ramen EIJI sometimes blends in a smear of rendered duck fat for a nuttier, more game-driven note, especially during Hokkaido's colder months when the team leans into warming profiles. For seasonal specials, a touch of garlic oil or chilli oil might pass through a different funnel, but the base fat underneath remains consistent.

Toppings follow the fat's lead. Chashu slices are seared and glazed so they can hold their own against the slick without disappearing. Soft-boiled eggs with jammy yolks add their own fatty element, layering against the surface rather than competing with it. Even a crisp sheet of nori benefits, softening quickly into the slick and lending a briny snap. The bowl is built around a central idea: each component should look as if it has always belonged in that broth.

International pop-ups, including the collaborations in Sydney and Melbourne that brought the brand's gyokai-tonkotsu to Australian chefs and diners, used the same back-fat discipline in unfamiliar kitchens. Furukawa's team renders and portions the fat off-site for transport, then reheats and portions at service. The result travels well, which is how Australian fans first encountered the brand's glossy crown.

Experiencing the approach without a plane ticket

For Australians who are not quite ready to book a winter trip to Hokkaido, there are still ways to understand what back fat adds to a bowl. Specialty ramen bars in Sydney's CBD and Surry Hills, as well as pockets of Melbourne like Fitzroy and Carlton, now serve gyokai-tonkotsu variations that incorporate a finished fat layer. Tasting these side by side with a shoyu or miso ramen is the fastest way to register the difference in mouthfeel and aroma retention.

Cooking at home can also be a rewarding experiment. Ask a butcher for a small portion of fresh pork back fat, render it low and slow, strain it through cheesecloth, and keep a jar in the fridge. Drizzled over a simple pork-and-seafood stock, even a weeknight ramen at home will feel closer to what Men-Eiji does in Sapporo.

If a trip to Japan is on the cards, the Men-Eiji Hiragishi BASE page lists opening hours, address, and a link to the menu in English. Pairing a visit with a broader Sapporo food crawl through Nijo Market and the city's emerging craft beer scene gives the trip extra texture.

Comparing finishing fats in modern ramen bowls

Fat type Source Flavour profile Best pairing Melt behaviour
Pork back fat Along the spine Neutral, clean Gyokai-tonkotsu, pork broths Soft at room temperature
Pork belly fat Streaked through belly meat Rich, meaty Spicy miso, heavier noodles Soft, holds shape longer
Chicken fat Skin and trimmings Savoury, slightly mineral Shio, lighter broths Liquid when warm
Duck fat Skin and fatty belly Nutty, gamey Duck ramen, rich shoyu Firm when cool
Garlic or chilli oil Aromatic infusion Fragrant, sharp Spicy or modern bowls Variable

A few pointers for appreciating the bowl

Plan your visit, walk in hungry, and let the gyokai-tonkotsu do the rest. Men-Eiji's kitchens are open late in Sapporo, and a bowl finished with their signature back fat is a reminder that the smallest garnish can carry an entire dish.