What Is Wagyu Beef? The Complete Guide
Thomas Joseph Butchery — The Complete Guide
What Is Wagyu Beef?
The most marbled, most talked-about, most misunderstood beef in the world. Here's everything you need to know about Wagyu — what it is, where it comes from, how the grading works, and where to find the best of it in the UK — from the team at Thomas Joseph Butchery.
Wagyu. It's a word that appears on restaurant menus alongside eye-watering price tags, on social media feeds of impeccably marbled steaks, and in butchers' windows alongside claims that vary enormously in credibility. For a category of beef that generates so much noise, genuine understanding of what Wagyu actually is — and what separates the extraordinary from the ordinary — remains surprisingly rare. This guide fixes that. By the end of it, you'll know exactly what you're looking at, what you're paying for, and how to find the real thing.
"Wagyu isn't a cut. It isn't a cooking style. It's a breed — and the most extraordinary expression of fat and flavour in the entire beef world."
The Basics What Is Wagyu Beef, Exactly?
Wagyu (pronounced wah-gyoo) is a Japanese word that translates literally as "Japanese cow" — wa meaning Japan and gyu meaning cow. It refers to four specific breeds of Japanese cattle: Japanese Black, Japanese Brown, Japanese Shorthorn and Japanese Polled. Of these, Japanese Black accounts for the vast majority of premium Wagyu beef produced and consumed globally.
What makes Wagyu genetically unique is an inherited predisposition to deposit fat within the muscle tissue itself rather than around it. This intramuscular fat — known as marbling — is what gives Wagyu beef its characteristic appearance: those extraordinary white veins and flecks distributed throughout the deep red muscle. It's also what gives it its flavour, its tenderness and that signature buttery, melt-in-the-mouth quality that distinguishes it so sharply from any other beef in the world.
Critically, this is not a quality that can be achieved through farming practice alone. It is genetic. Which means that not all heavily marbled beef is Wagyu — and not all beef labelled "Wagyu" is what it claims to be. We'll come to that.
The Science Why Is Wagyu Beef So Heavily Marbled?
The extraordinary marbling of Wagyu beef comes down to three factors working together: genetics, diet and time.
Genetics come first. Wagyu cattle carry a genetic mutation that causes fat to be deposited within the muscle fibres rather than subcutaneously — under the skin — as in most other breeds. This predisposition is the foundation that no amount of farming practice can replicate in a non-Wagyu animal.
Diet amplifies that genetic predisposition significantly. Wagyu cattle — whether raised in Japan, Australia or the UK — are typically fed a nutrient-rich diet for an extended period, often including high-quality grain, that supports the development of the marbling the breed is capable of. At TJB's Golden Herd Heritage Wagyu farms, cattle are raised on lush British pastures with additional feed grown on the farm itself — keeping food miles minimal while producing exceptional marbling.
Time is the third factor. Wagyu cattle are raised for significantly longer than standard beef breeds — often 30 months or more compared to 18–24 months for conventional beef. That additional time allows the marbling to develop fully and the flavour to deepen in a way that simply cannot be rushed.
🔥 Why Does Marbling Matter?
Intramuscular fat melts at a lower temperature than the external fat on standard beef — meaning it renders during the cooking process and effectively bastes the meat from the inside. The result is a steak that stays extraordinarily juicy, has a buttery richness on the palate, and carries a depth of umami flavour that no other beef can replicate. It's not just about appearance — the marbling is the flavour delivery system.
The Grading System Understanding Wagyu Grades — A5, MS12 and Beyond
Japanese Wagyu is graded by the Japan Meat Grading Association using two measures: yield grade (A, B or C — how much usable beef the carcass produces) and quality grade (1–5, covering marbling, colour, firmness and fat quality). A5 is the highest possible combination: maximum yield, maximum quality.
Within the quality grade, marbling is assessed on the Beef Marbling Standard (BMS) scale from 1 to 12. Our Kagoshima Wagyu A5 MS12 sits at the absolute pinnacle of this scale — the highest marbling score achievable, from the highest quality grade, from one of the most renowned Wagyu-producing regions in Japan.
| Grade | BMS Score | Marbling Level | What to Expect |
|---|---|---|---|
| A3 | 3–4 | Moderate | Noticeably better than standard beef. Good entry point. |
| A4 | 5–7 | High | Exceptional marbling, richness and tenderness. |
| A5 | 8–12 | Extraordinary | The pinnacle. Intense flavour, butter-soft texture. |
| A5 MS12 | 12 | Maximum possible | The highest standard of Wagyu available globally. |
The TJB Range Japanese, Australian & British Wagyu — What's the Difference?
At Thomas Joseph Butchery, we source Wagyu from three distinct origins — each producing a meaningfully different result. Here's how to understand them:
Golden Herd Heritage Wagyu — British
Developed in collaboration with a collective of the UK's most dedicated Wagyu farmers across Yorkshire, Kent and Sussex, our Golden Herd Heritage Wagyu is a TJB exclusive and the product of years of work to create something genuinely outstanding from British soil. Every animal is hand-selected from the top 1% of what comes through our doors. Raised on lush British pastures with additional feed grown on-farm to minimise food miles, this is Wagyu with full traceability, a dramatically reduced carbon footprint compared to imported alternatives, and a flavour profile that reflects the quality of British grassland. If you want world-class Wagyu with a British conscience, this is it.
Shop Golden Herd Wagyu →Kagoshima A5 MS12 — Japanese
Sourced from the Kagoshima prefecture in southern Japan — widely regarded as the epicentre of full-blood Japanese Wagyu production — our A5 MS12 Kagoshima represents the absolute highest standard of beef available anywhere in the world. Graded A5 with a marbling score of 12, raised in the forest-rich lands of southern Japan on a nutrient-rich diet by farmers who have perfected the craft over generations. These cattle live completely stress-free lives in an environment designed entirely around their wellbeing. The resulting beef is extraordinary: a level of marbling, tenderness and depth of flavour that has no peer. We hand-select every piece against the TJB standard — which means only the finest examples make it through. Available occasionally — when we have it, it will not last.
Shop Kagoshima Wagyu →Australian Wagyu — Full-Blood & Crossbreeds
Australia is now the largest producer of Wagyu outside Japan, and the quality at the top of the market is genuinely exceptional. Our Australian Wagyu selection includes full-blood Wagyu, Wagyu crosses, Black Angus Reserve and Black Onyx — each offering a distinct character. Full-blood Australian Wagyu carries the same genetic purity as Japanese Wagyu and, at its best, produces marbling scores that rival anything from Japan. Crossbreeds offer a more accessible price point with excellent marbling and the clean, grassy flavour that Australian-raised cattle are known for. A brilliant middle ground between British and Japanese for those looking to explore the category.
Shop Australian Wagyu →🔥 A Word on "Wagyu" Labelling
Be cautious of beef labelled simply as "Wagyu" without further detail. In the UK, the term has no legal protection — meaning beef from animals with as little as 6.25% Wagyu genetics (a great-great-grandparent) can technically be marketed as Wagyu. At TJB, every Wagyu product we sell comes with full provenance and traceability. We know the farm, the animal, the grade and the genetics behind every piece. If a product can't tell you those things, be sceptical.
Cooking It How to Cook Wagyu Beef — The Key Rules
Wagyu behaves differently to standard beef during cooking — and understanding why will help you get the most from it. The intramuscular fat melts at a lower temperature than standard beef fat, which means Wagyu needs slightly lower heat and shorter cooking times to achieve the same doneness. Apply the same heat you'd use for a grass-fed ribeye and you risk rendering too much of that extraordinary fat before the meat reaches your desired temperature.
Use lower heat than you think you need. A medium-high pan rather than screaming hot. For thinner Wagyu cuts like our Wagyu Bavette, this makes a significant difference to the eating quality.
Cook to medium-rare. An internal temperature of 54–57°C is where Wagyu is at its finest — the fat has rendered into the muscle fully, the centre is pink and deeply juicy, and the full flavour complexity is expressed. Going beyond medium risks losing the qualities that make it special.
Rest generously. Wagyu benefits from a longer rest than standard beef — at least 8–10 minutes for a standard steak cut. The marbling continues to distribute through the muscle as it rests and the result is a significantly more even, juicy eating experience throughout the entire piece.
Season simply. Good flaky sea salt before cooking. Cracked pepper after. Nothing else is needed or wanted — the Wagyu flavour is the point, and anything more complex will compete with it rather than complement it.
For a full cook guide covering all TJB cuts, see our How To BBQ Perfectly guide.
Frequently Asked Questions
Everything You've Ever Wanted to Know About Wagyu Beef
What makes Wagyu beef different from regular beef?
Wagyu cattle carry a unique genetic predisposition to deposit fat within the muscle tissue itself — known as intramuscular fat or marbling — rather than around it. This marbling melts during cooking and bastes the meat from the inside, producing a level of tenderness, juiciness and flavour depth that no other breed of cattle can replicate. The difference is genetic, not just a product of farming practice.
What does A5 mean in Wagyu beef?
A5 is the highest possible grade in the Japanese Wagyu grading system, assessed by the Japan Meat Grading Association. The "A" refers to yield grade — how much usable beef the carcass produces — and the "5" refers to quality grade, which covers marbling, colour, firmness and fat quality on a scale of 1 to 5. A5 represents the maximum in both categories. Within A5, marbling is further scored from 8 to 12 on the Beef Marbling Standard scale — with MS12 being the absolute pinnacle.
Is British Wagyu as good as Japanese Wagyu?
It depends on what you value. Japanese Wagyu — particularly A5 MS12 from Kagoshima — sits at the very pinnacle of beef marbling globally and is an extraordinary eating experience. British Wagyu, like our Golden Herd Heritage Wagyu, offers outstanding marbling with full British traceability, dramatically lower food miles, and a flavour profile that reflects the quality of British pasture. For everyday Wagyu eating, British is exceptional value and quality. For a once-in-a-while experience that needs no peer, Japanese A5 is in a category of its own.
Why is Wagyu beef so expensive?
Several factors combine to make genuine Wagyu significantly more expensive than standard beef. The cattle are raised for considerably longer — often 30 months or more versus 18–24 for conventional breeds. The farming is more intensive, with careful diet management and welfare standards that cost more to maintain. Genuine full-blood Wagyu genetics are carefully controlled and the herd sizes are much smaller than commercial beef operations. And at the top of the market — A5 Japanese Wagyu — the supply is genuinely limited by the number of animals that meet the grade each year. You are paying for rarity, time and an eating experience that cannot be replicated.
How should I cook Wagyu beef at home?
Use slightly lower heat than you would for standard beef — Wagyu fat melts at a lower temperature and needs less heat to render fully. Season simply with flaky sea salt before cooking and cracked pepper after. Cook to medium-rare (54–57°C internal temperature) and rest for at least 8–10 minutes before serving. The less you interfere with Wagyu, the better it tastes — the flavour is extraordinary on its own and requires no complex sauces or marinades.
What is the difference between Wagyu and Kobe beef?
Kobe beef is a specific type of Wagyu — but not all Wagyu is Kobe. Kobe is a protected designation referring exclusively to Tajima-strain Japanese Black cattle, raised in Hyogo Prefecture in Japan, that meet a strict set of production criteria and achieve a BMS of 6 or above. It is one of the rarest and most tightly controlled beef designations in the world. Genuine Kobe is extraordinarily rare outside Japan — if you see it on a menu or in a shop, verify the provenance very carefully. All other Wagyu — including A5 Kagoshima, Australian Wagyu, and British Wagyu — is outstanding beef in its own right, but it is not Kobe.
Can I buy Wagyu beef online in the UK?
Yes — and Thomas Joseph Butchery offers one of the most comprehensive Wagyu ranges available from any UK online butcher. We stock our exclusive Golden Herd Heritage British Wagyu, full-blood and crossbred Australian Wagyu, and — when available — A5 MS12 Kagoshima Japanese Wagyu. Every piece is cut fresh to order and delivered next day in our sustainable cool packaging, staying chilled for up to 48 hours in transit. Full provenance on every product, always.
Is Wagyu beef healthier than regular beef?
Wagyu beef contains a higher proportion of monounsaturated fatty acids — the same type found in olive oil — compared to standard beef. It also contains higher levels of conjugated linoleic acid (CLA) and omega-3 and omega-6 fatty acids. While Wagyu is still a red meat and should be consumed as part of a balanced diet, its fat profile is considered by many nutritionists to be more favourable than that of conventionally raised beef. It is also naturally richer, meaning smaller portions tend to be more satisfying.
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