1. Defining the Standard
Tuna Number 9 is a premium classification system established by Goldtuna, unique in the domestic landscape.
It is far more than a marketing title.
It is a scientific benchmark that quantifies the attitude, technique, and philosophy of handling bluefin tuna.
We believe tuna should be evaluated by evidence, not by intuition. That is where Number 9 begins.
Quality Certification for Tuna No. 9
2. The Five Pillars of Certification
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Aging Time & Temperature |
The tuna undergoes 5 to 8 hours of aging and stabilization at 0°C. This low-temperature process minimizes tissue damage and preserves the harmony between the marbling and protein. |
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Marbling Content |
A fat content of 60% or higher is required. The marbling must be delicately dispersed throughout the meat, reminiscent of fallen snow. |
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Selection of Cuts |
Limited exclusively to the collar meat and the foremost part of the fatty belly. These represent rare portions of less than 4kg from a single fish. |
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Specimen Integrity |
Only bluefin tuna weighing over 160kg are considered. Each must pass a rigorous verification of fat distribution homogeneity and blood flow density. |
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Visual Luster |
The hue must range from a bright to a soft, pale pink. A transparent gloss must be maintained, visible both to the naked eye and under precise lighting. |
The prized collar and fatty belly cuts of Bluefin Tuna
3. Philosophy and Meaning
Tuna Number 9 is more than a grade.
It transcends the skill of the blade, symbolizing an ethical approach to life and the discipline of aging.
Before a single piece is served, it is imbued with the time of quiet dedication, the temperature of preservation, and the standard of heartfelt hospitality.
Representative Choi Yeon defines this standard with profound simplicity:
"Tuna is not a food to be judged by taste alone. It should be evaluated by the heart that handles life. Tuna Number 9 is the numerical result of that heart."
The signature cubing technique of Goldtuna
4. Operational Commitment
Limited to 10 guests per day (Exclusively by reservation)
Standardized across both Sinsa and Bangi locations
Full disclosure of tail-cut images, aging logs, and temperature records upon request
Exclusively featured within the King's Banquet 15-course omakase
Preserving the integrity of texture and richness
5. Our Brand Message
Tuna Number 9 — A technique that bows before life.
Eight hours of waiting at zero degrees.
The time required to select just two perfect portions from an entire life.
This quiet dedication and these uncompromising standards are the new peak created by Goldtuna.
The full omakase selection
→ Insights into the standards of a premium omakase experience