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    Wagyu Sirloin Whole 3.5kg - SB 4-5

    $350.00

    this Wagyu sirloin delivers melt-in-your-mouth texture balanced with the bold, rich beefiness that sirloin is famous for.

    Wagyu Sirloin Whole 3.5kg - SB 4-5 is backordered and will ship as soon as it is back in stock.

    Pickup available at Peter Augustus Store Camp Hill

    Usually ready in 24 hours


    Diamantina Wagyu Sirloin Whole

    Melt-in-your-mouth elegance. Bold beef character.

    The Diamantina Wagyu Sirloin Whole is a 3.5kg centrepiece cut designed for those who love both tenderness and flavour. Graded SB 4 to 5 for superior marbling, this Wagyu sirloin delivers a melt-in-your-mouth texture balanced with the bold, rich beefiness that sirloin is famous for.

    Hand-selected from Stanbroke’s world-class Wagyu program, this cut is versatile enough to be portioned into thick steaks or roasted whole for an unforgettable dining experience. Whether you are preparing for a special gathering or stocking your freezer with premium steaks, this sirloin is the ultimate choice for chefs and entertainers alike.

    Why Choose Diamantina Wagyu Sirloin SB 4 to 5?

    • Superb marbling ensures tenderness and bold flavour
    • Premium Wagyu from Stanbroke’s renowned program
    • Butcher-prepared, vacuum sealed, and chilled
    • Ideal for entertaining, meal prep, or fine dining

    Perfect For

    • Entertaining and dinner parties
    • Premium meal prep and custom portions
    • Gifting to Wagyu enthusiasts
    • Creating an impressive centrepiece roast

    Product Highlights

    • 100% Australian Wagyu beef
    • Marble score 4 to 5
    • Chilled, vacuum sealed, approx. 3.5kg whole cut
    • No added hormones

    Cooking Inspiration

    Steakhouse Style: Slice into 250 to 300g steaks, sear over high heat, and serve with truffle butter or chimichurri.

    Whole Roast: Season with salt, rosemary, and garlic, roast at 160°C to 52 to 54°C internal temperature for medium rare, rest, and carve thinly.

    Sous Vide & Sear: Cook at 54°C for 2 hours sous vide, then sear for a luxurious, restaurant-quality finish.

    Delivery & Storage

    Keep frozen at or below −18°C.
    Thaw under refrigeration (0–4°C) before use.
    Do not thaw at room temperature.
    Do not refreeze once thawed.
    Once thawed, consume within 24–48 hours.
    Cook thoroughly before consumption.

    Striploin

    Striploin, also known as Sirloin, New York Strip, or Porterhouse (when bone-in), is a premium cut prized for its bold flavour and balanced tenderness. It comes from the short loin of the cow and features a fine grain with a satisfying bite. It's a favourite among chefs and home cooks alike for its generous marbling and robust, beefy taste.

    Frequently Asked Questions

    Our Beef

    Where does our beef come from?

    All of our beef is from our parent company Stanbroke Beef. This is important as the quality of the beef and ultimately your eating experience is determined by the care that has been shown to the animal during each stage of the production process. Any undue stress the animal experiences at any stage of its life is detrimental to the beef it will produce.

    As Stanbroke owns and operates each stage of the production process, strict best practices are followed to ensure the animals always receive the highest of care and that’s why at Peter Augustus we can guarantee the quality of our product each and every time.

    SB Marble Scores

    What is an SB Marble Score?

    The SB Score measures intramuscular fat (the white flecks in the meat). Higher scores mean more marbling, which results in superior tenderness, juiciness, and a richer, buttery flavour.

    Which score should I choose?

    • SB 0–2: Leaner, traditional beef flavour with a robust texture.
    • SB 3–5: Our "everyday premium" level; a perfect balance of flavour and tenderness.
    • SB 6–10: The indulgent peak, featuring extreme marbling for a melt-in-your-mouth experience.

    Meat Quality & Colour

    What is vacuum sealing and how does it extend shelf life?

    Vacuum sealing removes air from the packaging, slowing oxidation and bacterial growth to extend freshness and shelf life. When stored correctly at 0–4°C, you can expect the following guide:

    • Beef primals & whole cuts: up to 28 days
    • Beef (steaks): up to 21 days
    • Beef (bone-in): up to 14 days
    • Lamb: up to 28 days
    • Pork: up to 10 days
    • Ham: up to 30 days
    • Sausages: up to 9 days
    • Chicken (frozen): up to 12 months
    • Salmon (frozen): up to 12 months
    • Smoked salmon: up to 30 days

    For longer storage, keep products frozen at -18°C, where vacuum sealed meat can last 1 to 3 years depending on the cut and consistency of temperature.

    Once opened, the shelf life reverts to that of standard fresh products, so we recommend consuming promptly.

    For longer delivery routes, some items may arrive partially or fully frozen to ensure they remain within safe temperatures during transit.

    Why is my steak dark in the vacuum pack?

    Our beef is vacuum sealed to lock in freshness and extend shelf life by removing oxygen. This can cause the meat to appear darker or slightly purplish due to natural myoglobin, which is completely normal.

    Once opened, simply let your steak rest out of the packaging for 10 to 20 minutes. As it’s exposed to air, it will “bloom” back to its natural rich red colour. Rest assured, your beef is fresh and perfectly safe to enjoy.

    Is it safe to eat?

    Yes. If the “Use By” date is within range your meat is fresh. Any colour variation from vacuum sealing is normal and will return to its natural red once opened and allowed to bloom.

    Delivery & Packaging

    What are your delivery fees?

    We offer a range of pickup and delivery options to suit you:

    • Free pickup is available from our Camp Hill store in Brisbane. Simply select pickup at checkout.
    • Free shipping is available on subscription-only orders.
    • Free shipping is automatically applied to orders over $200.
    • Refrigerated delivery starts from $30 (including GST), with final pricing based on your location, order size, and weight. Enter your address at checkout to calculate the exact rate.

    All delivery orders are packed in a food-safe, insulated chilled box with ice packs to maintain safe temperatures throughout transit.

    Can I request custom cutting instructions?

    Yes, our butchers are happy to accommodate custom cutting requests where possible and safe to do so. For example, you may like a rump cap portioned into steaks. Simply specify your preferred thickness or weight per piece, such as approximately 2.5cm or 300g portions.

    You can add these instructions in the “View Cart” section before checkout using the notes box or send them through to us via email.

    How is my order kept cold?

    We use specialist refrigerated courier partners to keep your order within the cold chain from dispatch to delivery. Each order is packed in a thermal carton lined with VISYCELL® sustainable insulation, a food-grade, biodegradable material designed to maintain a consistent chilled temperature throughout transit.

    We also include large 1kg ice gel packs in every box to help keep your products at optimal temperature. Our packaging has been tested to maintain safe temperatures for a few hours after delivery when left in a shaded area.

    My box arrived looking a bit scuffed. Is the meat okay?

    While the outer carton may show signs of handling during delivery, the internal insulation is specifically built to protect the contents and preserve freshness.

    What should I do if I have concerns?

    If you detect any issues with the temperature or seal of your products upon arrival, please contact our team immediately so we can find a solution for you.