What Is Black Onyx Beef? Marbling, Quality & Cuts – Peter Augustus Craft Butcher

The Butcher's Block | Learn + Choose

What Is Black Onyx Beef?

Premium Black Angus with more marbling, a richer finish and enough beef-forward character to sit naturally between standard Angus and Wagyu.

Quick answer: Black Onyx is Stanbroke's premium grain-fed Black Angus program. It uses pure Black Angus genetics, a minimum 230-day grain finish and HGP-free production. Think of it as the sweet spot when you want richer Angus without moving all the way into the more indulgent eating style of Wagyu.

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Where Black Onyx fits

AngusClassicBold beef flavourBalanced marblingEveryday premium

Black Onyx | Sweet SpotRicher AngusMore marblingMore tendernessStill beef-forward

WagyuMore IndulgentHigher marbling potentialSofter textureRicher finish

If you are choosing between the wider beef categories, use the Angus vs Wagyu comparison. Black Onyx belongs in the middle when you want to step up from standard Angus without making extreme marbling the main event.

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Which Black Onyx cut should you start with?

Easy First Choice

Black Onyx Sirloin SB 5

Best for: a versatile introduction to Black Onyx. You get Angus flavour, extra marbling and an approachable texture for pan or BBQ cooking.

From A$33.50Choose Sirloin

Butcher's Pick

Black Onyx Rib Fillet SB 5

Best for: the clearest Black Onyx experience. Rib Fillet brings tenderness and juiciness together with the richer SB 5 marbling level.

From A$38.80Choose Rib Fillet

Showstopper

Black Onyx Tomahawk SB 5

Best for: sharing, BBQs and special occasions when presentation matters as much as the steak itself.

From A$140Choose Tomahawk

New to Black Onyx? Start with Rib Fillet SB 5. It shows the program's richer marbling and tenderness clearly while keeping the bold character people expect from Black Angus.

Learn

Why Black Onyx is different

230+minimum days on grain

PureBlack Angus genetics

HGP-Freeproduction program

Stanbrokemanaged supply chain

Those controls help support a consistent premium Angus eating experience. Marble score still matters within the range, so use the score on the individual product to understand how rich the steak will eat.

Want to understand the number? See The Number on Your Steak Actually Means Something.

Cook

Cook the cut you chose

Explore step-by-step cooking guides from The Peter Augustus Kitchen.

Sirloin or Rib Fillet

Use strong direct heat and let the marbling do the work. Keep seasoning simple and use internal temperature rather than guesswork.

Cook Steak by Marble Score

Tomahawk

For the thick sharing cut, build the centre gently first and finish with a hard sear before resting and carving.

See the Tomahawk Cooking Guide

FAQs

Quick answers

Is Black Onyx Wagyu?

No. Black Onyx is a premium pure Black Angus program. Wagyu is a different beef category with a greater tendency toward very high marbling.

How is Black Onyx different from standard Angus?

Black Onyx uses a longer minimum 230-day grain finish and is positioned for greater marbling and a richer premium Angus eating experience while maintaining beef-forward character.

Which Black Onyx cut is best for a first-time buyer?

Black Onyx Rib Fillet SB 5 is the strongest all-round starting point if you want to experience both the tenderness and richer marbling of the program. Sirloin SB 5 is a good alternative if you prefer a more traditional steak profile.

What does SB 5 mean?

SB 5 indicates a richer level of visible intramuscular marbling. Use the marble grading guide to compare it with lower and higher scores.

When should I choose the Tomahawk?

Choose the Tomahawk when you want one large steak to cook, carve and share as the centrepiece of a BBQ or special meal.

Butcher's Pick

Start with Black Onyx Rib Fillet SB 5.

It is the clearest way to taste what makes Black Onyx different: Angus character, extra marbling, tenderness and a richer finish.

Shop Black Onyx Rib Fillet SB 5

What is Black Onyx Beef?