Is A5 Beef Really the Tastiest? The Hidden Truth of 和牛 Grading

1. Is the Image “A5 Rank is the Most Delicious” True? Common Doubts and Misconceptions

Hello everyone. This is Sondo from 黑5.

When you open the menu at a 烧肉 restaurant, or browse the meat section of a department store basement, doesn’t your eye automatically drift to the words “A5 Rank Black 和牛”? You might unconsciously think, “Well, A5 rank must be the most delicious,” or “It makes sense that it’s expensive.”

Television food shows and social media are filled with catchy slogans like “Meltingly delicious premium A5 rank beef!” In modern Japan, the image that “A5 is the ultimate proof of delicious meat” is completely established. For a special day’s luxury or a dinner with important guests, it is only natural to want to choose A5 rank brand beef out of a desire to make a safe, high-quality choice.

However, as a meat professional who serves 烧肉 to customers on the floor every single day, I must share a crucial truth with you.

Actually, the “A5” score in 和牛 grading does not directly represent the “taste” or “deliciousness” of the meat.

You might be surprised to hear this, wondering, “Why is it so expensive then?” or “Isn’t A5 supposed to taste the best?” Today, we will dissect the scientific truth behind the 和牛 grading system, explore what truly delicious 烧肉 that doesn’t cause stomach heaviness is, and reveal the standards we use at 黑5 to select and prepare our meat. By reading this article, your way of choosing 烧肉 will change dramatically, and you will discover the true essence of meat flavor.

2. The Science of 和牛 Grading! The True Definition of “A, B, C” and “1 to 5”

First, let’s look at how grades like “A5” or “A4” are decided. 和牛 grading in Japan is strictly determined by the Japan Meat Grading Association (JMGA) based on two combined criteria: an alphabetical “Yield Grade” and a numerical “Meat Quality Grade.”

Let’s look at the alphabetical “Yield Grade” (A, B, or C). This represents the ratio of usable meat (carcass) obtained from the cow after removing the bones, internal organs, and excess fat. A yield higher than average is graded “A,” standard is “B,” and below standard is “C.” In other words, this is an index of “production efficiency” or “yield size” for meat purveyors and farmers. It has nothing to do with the “taste” or “texture” experienced by the customer. Even if the meat is watery and lacks umami, it can still receive an “A” yield grade as long as the ratio of usable meat to bone is high.

Next is the numerical “Meat Quality Grade” (1 to 5). This is evaluated across five levels based on four criteria:

• Marbling (Beef Marbling Standard – BMS): The distribution of fat in the meat, evaluated on a 12-point scale.
• Color and Brightness (Beef Color Standard – BCS): The hue and luster of the red meat.
• Firmness and Texture: The fineness of the muscle fibers, texture, and tenderness.
• Fat Color and Quality (Beef Fat Standard – BFS): The whiteness and luster of the fat.

Each of these four categories is rated from 1 to 5, and the lowest score among the four determines the overall Meat Quality Grade. For example, even if the marbling is absolutely perfect (rating 5), if the meat color is slightly dull (rating 3), the final grade will be “3.” Within this system, the amount of marbling (BMS) carries massive weight. To secure a Meat Quality Grade of “5,” a BMS score between 8 and 12 is required, indicating a very dense, web-like distribution of fat.

Do you notice something missing here? Among all the evaluation criteria, there is not a single item measuring “amino acid content (strength of umami)” or “aroma (和牛 fragrance).”

The grading system is purely a visual standard to facilitate smooth market trading, not a score guaranteeing flavor. The reason why “A5 does not always mean delicious” or why “too much marbling can cause stomach heaviness after a few bites” lies in these technical definitions.

3. Beyond the Grade! The Truth About “Fat Melting Point” and “Oleic Acid” Determining Deliciousness

So, what actually determines the “true deliciousness” of meat? The key lies in the “oleic acid content” of the fat, and the resulting “fat melting point.”

The greatest characteristic of Japanese Black 和牛 and the reason it is celebrated worldwide is the extremely high ratio of oleic acid (an unsaturated fatty acid) in its marbling. Oleic acid, famous as the main component of olive oil, is known for health benefits such as lowering LDL cholesterol. In meat flavor, its crucial role is to dramatically lower the melting point of the fat.

While the fat melting point of standard imported beef or domestic crossbred beef is around 35°C to 40°C, the fat melting point of high-quality Black 和牛 is incredibly low, at about 16°C to 25°C—far below human body temperature. This low melting point is what creates the “meltingly tender texture” the moment the meat touches your 牛舌.

When you eat 和牛 with high-quality fat, the fat liquefies smoothly at body temperature, blending with the rich juices of the red meat. It tastes cleanly sweet without leaving a greasy residue. As the fat melts, it releases “和牛 aroma” (和牛-ko), a sweet, coconut-like fragrance that drifts through the nose. This low-melting-point fat is the secret behind “light, non-greasy 烧肉” that never leaves you with stomach heaviness.

Conversely, even if the meat is rated “A5,” if the oleic acid ratio is low and the fat’s melting point is high, the fat will not melt completely in your mouth and will leave a sticky, greasy coating on your 牛舌. This is the direct cause of the heavy feeling you might get after leaving a restaurant. That is why meat professionals do not buy based on the “A5” paper label alone; we must inspect each beef carcass with our own eyes to evaluate the breeding environment and fat quality.

4. Our Obsession with “Fresh, Never-Frozen” Meat Pulls Out 120% of 和牛’s Potential

Even if you source 和牛 with the finest fat quality, incorrect handling will ruin its potential in an instant. This is where 黑5’s obsession with “fresh, never-frozen quality” from sourcing to serving comes into play.

Today, many standard 烧肉 restaurants use meat that has been frozen for shipping and storage convenience. However, freezing meat turns the water inside the cells into sharp ice crystals, which expand and physically destroy the delicate cell walls from within.

When this meat is thawed, massive amounts of moisture and flavor escape as “drip” through the ruptured cell walls. This drip contains the amino acids, umami, and juices that give the meat its life. Once frozen and thawed, even an expensive A5 brand beef will turn out dry, tough, and, in the case of organ meats, develop an unpleasant metallic smell. Water lost once can never be recovered.

This is why 黑5 insists on fresh, never-frozen Black 和牛 横膈膜 and 牛舌. The raw cell walls are completely intact. When cooked on the grill, the unbroken cell walls hold the melting oleic acid and rich meat juices inside. The explosive burst of juicy sweetness you experience with your first bite is only possible with fresh, never-frozen meat.

5. The Essence of 黑5’s “Three Commitments”

6. Sourcing and Cutting Craftsmanship That Maximizes the Character of Each Cut

Once the meat’s potential is secured, how we portion and cut it makes all the difference. At 黑5, we move beyond the generic categories of “standard 牛里脊” or “standard short rib” and tailor our cuts to the specific qualities of each part.

Here, let us share a very interesting historical background of the Japanese 烧肉 industry. In fact, most “牛里脊” (Rosu) cuts served in 烧肉 restaurants across Japan today are not actually 牛里脊 (back muscle) cuts at all, but rather round/thigh (lean red meat) cuts. At 黑5, what we serve as “牛里脊” is also the finest, leanest rare cut from the A5 Black 和牛 round, known as “Shintama” (Knuckle).

Originally, the English word “牛里脊” (from which “Rosu” is derived) referred to fatty, marbled back muscles like sir牛里脊 and 眼肉. However, in the early days of Japanese 烧肉, imported lean back 牛里脊s became popular as “Rosu,” leading Japanese consumers to associate “Rosu” with “lean, non-greasy red meat.” Later, when the BSE crisis hit in 2001, the industry rushed to shift to domestic 和牛. Because premium 和牛 back 牛里脊 was too expensive for standard menus, restaurants looked to the “和牛 round” (thigh). It shared the same bright red appearance as imported 牛里脊 and had a rich beefy flavor, marking the beginning of the “牛里脊 = Thigh Meat” standard in Japanese 烧肉 history.

Conversely, for our “牛五花” (traditionally belly/short rib), we avoid the heavy, greasy short rib meat and instead select the premium “和牛 眼肉” (Rib rosu). Yes, 眼肉 is actually the ultimate “牛里脊” (back muscle) cut. Consequently, a fascinating reversal or **”naming twist”** occurs at 黑5: we use round meat (Shintama) for our 牛里脊, and a 牛里脊 cut (眼肉) for our 牛五花. This is the ultimate proof of 黑5’s commitment to optimizing the dining experience over rigid naming conventions, ensuring that our customers can enjoy marbled beef that never leaves them feeling heavy.

Since thigh meat like Shintama comes from active muscles, it has a natural tendency to be slightly tough. However, 黑5’s craftsmen perform precise trimming down to the millimeter to remove fine gristle and membranes. This yields an incredibly smooth texture alongside the deep, iron-rich flavor of red meat.

In particular, our “Special 牛里脊 (芯芯肉)” is sliced thin and seared on the grill using a technique called “rolling grill.” By rolling the meat while grilling, we prevent the juices from evaporating and lock in the rare tenderness. Serving it with a touch of wasabi delivers a culinary experience that surpasses any simple grade numbers.

Furthermore, serving 眼肉 as “牛五花” and thick-cutting its softest center section as “Otoko Ue 牛五花” has become our signature dish, continuing to attract repeat customers.

7. Enjoying Exquisite Meat at Its Best: The Value of the “纪州备长炭 炭火 Full-Attend Style”

No matter how carefully we select fresh meat and apply precision prep, everything is lost if the customer leaves it on the grill too long or burns it. Overcooking dries out the meat, resulting in a loss of the customer’s valuable dining investment.

That is why 黑5 has strictly maintained its “Full-Attend Style” (where staff grills the meat at your table) since our founding. We use “纪州备长炭 炭火,” which is notorious for being difficult to control but emits powerful far-infrared heat. This heat quickly sears the outside of the meat, creating a barrier that locks in the moisture (oleic acid and meat juices) inside.

Our staff monitors the 炭火’s heat zone and applies a unique “reflux heating method,” flipping the meat every 10 to 15 seconds. This prevents the heat from applying only in one direction and stops the juices from rising and evaporating, gently and evenly raising the internal temperature. When placed on your plate, the meat is crispy on the outside and unbelievably tender and juicy on the inside. This is the true flavor of 烧肉 when sourcing, prep, and grilling connect perfectly.

8. Experience the True Value of 黑5: Light, Delicious 烧肉 That Leaves You Smiling

To the question, “Is A5 grade beef really the most delicious?” our answer is clear.

The numerical grade is just one visual reference. Truly delicious meat is born from the “low melting point of fat (oleic acid)” nurtured by pedigree and feed, the “freshness of cells” kept intact by never freezing, and the “knife work and professional grilling” that bring it all to life.

If you have ever eaten A5 beef only to find the grease too heavy to finish, we invite you to experience 黑5. We promise a genuine 和牛 experience where the meat remains light and clean to the very last bite, releasing deep natural sweetness and aroma. Delivering a dining experience that surpasses the price tag is what 黑5 defines as true cost performance.

Tonight, at our Honten, East Exit, and 歌舞伎町店 branches, we have prepared our signature fresh meats under the strict eyes of our professionals. With the 纪州备长炭 炭火 glowing hot, we look forward to welcoming you.

• 烧肉 黑5 Honten (Main Branch)
  1F Nishi-池袋 Bldg, 2-46-3 池袋, Toshima-ku, Tokyo / 5 min walk from JR 池袋 Station
• 烧肉 黑5 Higashiguchi (East Exit Branch)
  1F Tsukiji Bldg, 1-42-16 Higashi-池袋, Toshima-ku, Tokyo / 3 min walk from JR 池袋 Station East Exit
• 烧肉 黑5 歌舞伎町店
  1F Sankyo Akagawa Bldg, 2-21-4 歌舞伎町店, Shinjuku-ku, Tokyo