What Is Black Onyx Beef?
Long-fed Black Angus with clearly labelled marble scores, consistent quality and a richer eating experience.
The quick answer
Black Onyx is Stanbroke's premium grain-fed Black Angus program. It combines pure Black Angus genetics, a minimum 230-day grain finish, HGP-free production and clearly labelled SB marble scores. Choose SB 2 for a more beef-forward bite or SB 5 for greater richness and tenderness.
Understand the program
Why Black Onyx Is Different
Black Onyx is built around breed, time, production standards and traceability. These factors work together to create consistent marbling and a dependable eating experience.
Days on grain
A long finishing period supports gradual marbling development.
Black Angus
Selected genetics provide the foundation for flavour and consistency.
Free production
No hormonal growth promotants are used in the production program.
Known source
Stanbroke manages the chain from breeding through processing.
Compare the finish
What the Extra Time Changes
Standard grain-fed
Marble score can vary
Production standards vary by supplier
Often sourced through multiple suppliers
Black Onyx by Stanbroke
Multiple clearly labelled SB scores
Pure Black Angus genetics
HGP-free production
Known Stanbroke supply chain
Trace the quality
From Breed to Delivery
More control across the supply chain means better visibility over origin, handling, production standards and marble score.
How Stanbroke controls quality
Choose your experience
How to Read the SB Marble Score
The SB score measures visible intramuscular fat. Higher scores generally mean more marbling, a softer texture and greater richness. The cut still matters, so use the score and cut together.
Beef-forward
Leaner marbling, a firmer bite and a more traditional Angus flavour. Choose this range for everyday grilling and pan cooking.
Balanced richness
More visible marbling with a strong balance of flavour, tenderness and juiciness. Many premium Black Onyx cuts sit here.
Wagyu territory
Very high marbling is more commonly associated with premium Wagyu programs and benefits from smaller portions and controlled heat.
Cook with the cut and score
How to Cook Black Onyx
Moderately marbled cuts work well over direct heat. Thicker or richer cuts benefit from slower temperature control followed by a short final sear.
Steaks and smaller cuts
Hot pan or grill
Pat the surface dry, season simply and use strong direct heat. Sirloin, rib fillet, rump and picanha can develop a deep crust while staying juicy inside.
Match the method to the SB scoreThick sharing cuts
Reverse sear
For a Black Onyx Tomahawk SB 5, bring the centre up gently, then finish with a fast sear. Rest before carving across the grain.
Follow the Tomahawk cooking guideBlack Onyx may appear darker or slightly purple in the pack because oxygen is reduced. Open the pack and allow the beef to bloom for 10 to 20 minutes. If the use-by date is current and the seal is intact, this colour change is normal.
Your next useful read
Learn, Compare, Then Cook
Shop active Black Onyx cuts
Choose the Eating Experience You Want
These products were selected from the active Black Onyx range. Start with your preferred richness, then choose the cut and cooking method.
Black Onyx Picanha Rump Cap SB 2
A lighter-marbling option with bold rump flavour and a distinctive fat cap.
Shop this cut
Black Onyx Picanha Rump Cap SB 5
The same cut with more marbling, giving you a useful side-by-side score comparison.
Shop this cut
Black Onyx Sirloin SB 5
A versatile steak with Angus flavour, enhanced marbling and an easy-to-enjoy texture.
Shop this cut
Black Onyx Rib Fillet SB 5
A richly marbled rib cut built for high-heat searing and a tender, juicy finish.
Shop this cutQuick answers
Frequently Asked Questions
What does Black Onyx beef taste like?
Black Onyx delivers a rich and consistent Angus eating experience. SB 2 cuts have a more traditional beef-forward bite, while SB 5 cuts are softer, juicier and more richly marbled.
Is Black Onyx beef HGP-free?
Yes. The Black Onyx program is produced without hormonal growth promotants.
What marble scores are available?
The active retail range includes Black Onyx cuts at SB 2 and SB 5. Availability can change, so confirm the score on each product page before ordering.
How is Black Onyx different from Wagyu?
Black Onyx is a pure Black Angus program. Wagyu is a different breed with a stronger genetic tendency toward very high marbling. This changes the richness, portion size and cooking approach.
Can I order Black Onyx online?
Yes. Peter Augustus sells Black Onyx online and delivers it chilled within current delivery areas. Check the product page for availability and the delivery information for your location.
Choose with confidence
Find Your Black Onyx Cut
Start with the SB score, match it to the cut, then cook it in the way that suits its thickness and marbling.
Shop Black Onyx
