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How to Grill Yakiniku Offal (Horumon)? Cuts & Pro Techniques

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Hello everyone, this is Sondo from Kuro5.

When you visit a yakiniku restaurant, finish your cuts of Kalbi, Loin, and Harami, and decide to order fresh offal (Horumon) to end the meal, how do you usually grill it? Have you ever had fat drip into the coals, starting a flare-up that charred the meat black? Or perhaps you kept rolling the offal around the grate, only to find all the fat melted away, leaving a tough, rubbery piece of skin?

Offal contains complex muscle structures and fat layers compared to standard muscle meats (like loin or rib cuts), making it one of the most challenging cuts to cook properly. However, when you understand the unique traits of each cut, master professional cleaning and scoring prep, and apply the correct heat control, Horumon transforms into a tender, juicy delicacy bursting with flavor. Today, I would like to explain the secrets behind popular offal cuts like “Shimacho” and “Kamimino,” our prep techniques, the golden rule of fat-first grilling, and the memorable story of how Kuro5’s signature “full-attend style” (table-side grilling service) was born.

1. A Universal Yakiniku Challenge: Why is Offal (Horumon) So Difficult to Grill?

First, why is offal so much more difficult to grill than standard cuts of beef?

Standard meats like Kalbi or Harami feature muscle and fat blended together evenly, making them easy to cook by searing both sides until the center warms. However, intestine cuts like Shimacho consist of two completely different layers attached back-to-back: a firm, chewy muscle skin layer and a rich, melting fat layer.

If you roll this two-layered meat randomly across the grill, the fat melts and drips onto the coals, sparking flare-ups that scorch the surface black. If you move it to the edge of the grill out of fear, the skin layer fails to cook properly, leaving a rubbery, unchewable texture. The difficulty of grilling Horumon lies in rendering the fat sweet and fragrant without burning it, while simultaneously applying enough heat to soften the firm skin tissue.

2. The #1 Favorite Cut “Shimacho” (Large Intestine) and Our Obsession with Fresh Wagyu Offal

Among all offal cuts, the undisputed favorite is “Shimacho” (large intestine). It takes its name from the striped (shima) muscle pattern visible on its outer surface.

The appeal of Shimacho lies in its thick, pleasantly chewy skin combined with a burst of sweet, savory fat. Compared to small intestine cuts (Hoso), Shimacho features a firmer body and a clean fat profile, making it a favorite for offal connoisseurs.

At Kuro5, we source exclusively fresh domestic Wagyu offal from trusted suppliers. While imported offal can lack fat depth and carry undesirable odors, fresh Wagyu Shimacho delivers pure, sweet fat with zero odor. On the day of delivery, our chefs hand-clean every piece, trimming away excess fat while deliberately leaving the flavor-rich fat intact. This precise hand trimming is the first step toward creating non-greasy, exquisite Horumon.

3. Is “Skin-Side First” a Myth? The Pro Golden Rule: “Cook the Fat Side First”

Now, let us share a pro technique that overturns common yakiniku beliefs. Many guides claim you should place Shimacho skin-side down first to heat the tough skin. However, according to Kuro5’s trained chefs, this is a major mistake that ruins the meat’s moisture and flavor.

Kuro5’s golden rule for grilling Shimacho is: “Place the fat side down first, and sear the fat thoroughly.”

Unlike muscle fat, intestine fat does not harden under heat. Placing the fat side down over medium charcoal heat allows the fat to sear slowly until it turns golden brown. Searing the fat renders away excess grease, concentrating its sweet umami. Once the fat is caramelized, turn the piece over and sear the skin side for only about 1 minute.

If you grill the skin side for too long, the muscle proteins contract rapidly, drying out the skin and rendering it rubbery. Searing the fat thoroughly and finishing the skin quickly yields a crispy exterior, a tender bite, and a burst of savory juice.

4. Crisp Texture and Sweetness: Premium “Kamimino” (1st Stomach) and Prep Craftsmanship

Another favorite offal cut alongside Shimacho is “Kamimino” (1st stomach).

A cow possesses four stomach compartments, and the first and largest is the “Mino.” Because cows chew their cud continuously, the Mino consists of thick, active muscle tissue. Standard Mino can be dense and difficult to chew.

However, Kuro5 serves “Kamimino”—the thickest, finest-grained section near the stomach entrance. Kamimino is significantly softer and cleaner than standard Mino. It offers a crisp, satisfying bite and a light, clean sweetness as you chew.

5. Butterfly Cuts and Fine Score Cuts: The Secret to Creating Perfectly Tender Offal

Even with high-quality Wagyu Kamimino, simply dicing and grilling it would cause the muscle fibers to shrink and harden. In the Kuro5 kitchen, our chefs perform precise knife prep before serving.

When portioning fresh Kamimino, our chefs slice into the center of each thick piece and open it flat, creating a butterfly cut (観音開き) similar to preparing scallops. This evens out the thickness, establishing a flat surface for uniform heating.

Next, our chefs slice fine, crosshatched score cuts (隠し包丁) across the surface at millimeter intervals. Controlling the depth and angle of each cut severs the tough muscle fibers, ensuring the meat cooks quickly and remains tender. Heat from the Binchotan charcoal penetrates these fine cuts, cooking the meat instantly before it can toughen.

6. Gentle Heat Over Binchotan: The Art of Grilling Kamimino Without Toughening the Fibers

Even with butterfly score cuts, Kamimino requires delicate fire control, as overcooking causes it to lose moisture and harden.

Kuro5’s grilling philosophy for Kamimino is: “Heat the Mino so gently that it doesn’t even notice it’s being cooked.”

Rather than searing it over aggressive flames, we turn the scored Kamimino frequently over Binchotan heat for about 1 minute. The fine score cuts allow heat to reach the center almost instantly, leaving the outside crisp while preserving a tender, juicy interior. Enjoying it with salt and lemon or garlic soy sauce highlights its crisp texture and subtle sweetness.

7. Born from Burnt Salt Horumon: The Origin Story of Kuro5’s Signature “Full-Attend Style”

While mastering the fat-first rule for Shimacho and gentle turns for Kamimino produces incredible results, doing so yourself over hot charcoal can be difficult during a relaxed meal. This is why Kuro5 staff grills all meat at your table in our signature “full-attend style.”

This service was not created as a corporate policy, but grew out of a real incident involving burnt salt Horumon at our original shop.

In 2008, when Kuro5 opened its tiny 7-tsubo (23 sq meter) location in Ikebukuro, the owner noticed guests struggling to grill fatty salt Horumon. The fat caught fire, flare-ups filled the air with smoke, and the meat charred black. Unable to watch good meat go to waste, the owner stepped in, saying, “Wait! You can’t grill it like that!” He picked up the tongs and grilled the Horumon for them at their table.

8. “Delicious! What is This?!” How Customer Amazement Established Kuro5’s Grilling Pride

The guests were initially surprised by the owner stepping in, but their reaction changed completely upon taking their first bite of the professionally seared Horumon. Their eyes widened, and they exclaimed, “Delicious! What is this?!”

The contrast between the burnt piece they had tried earlier and the tender, juicy Horumon prepared by the owner surprised the entire dining room. Nearby tables quickly asked, “Excuse me! Could you grill ours too?” Soon, the owner was running between tables grilling meat for every guest in the restaurant.

Seeing guests smile with excitement, the owner realized: “No matter how good the meat is, grilling determines whether its value is zero or 120 points. This table-side service is Kuro5’s true calling.” From that evening, our full-attend service became Kuro5’s signature tradition, preserved across all our locations today.

9. Comparison: 3 Key Differences Between Self-Grilling Offal and Kuro5’s Pro Full-Attend Style

3 Differences Between Self-Grilling Offal and Kuro5’s Pro Full-Attend Style

1. Hand Preparation and Prep Skill:

  • Standard Shops: Offal is sliced directly without custom scoring, leaving excess fat or tough fibers that make Mino difficult to chew.
  • Kuro5: Fresh Wagyu offal is hand-cleaned daily, leaving flavor-rich fat on Shimacho and applying butterfly score cuts to Kamimino for tenderness.

2. Heat Orientation and Timing:

  • Standard Shops: Cooking skin-side first dries out the meat, while unmanaged fat causes flare-ups and charred exteriors.
  • Kuro5: Shimacho is cooked fat-side first with a quick 1-minute skin sear, while Kamimino is turned gently for 1 minute over Binchotan heat.

3. Dining Comfort and Experience:

  • Standard Shops: Guests must constantly monitor flare-ups and guess when the offal is ready, risking overcooking.
  • Kuro5: Trained staff grills every piece at your table, eliminating flare-ups and serving meat at its peak moment of flavor.

10. Conclusion: Enjoy the Ultimate Juicy Offal at Kuro5 Tonight

If you have ever found offal difficult to grill or chew, we invite you to experience Kuro5’s prepared Wagyu Horumon. Professional knife scoring combined with table-side Binchotan grilling will change your perspective on offal.

Enjoy the sweet fat of our Shimacho, the crisp bite of Kamimino, and the warm hospitality of our table-side grilling service.

Please visit Kuro5 Honten, Higashiguchi, or Kabukicho tonight. We look forward to serving you our signature Wagyu offal alongside our selection of meats and drinks.

Kuro5 Store Front

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