Select the primal
Loin, rib or round with good fat cover. Meat with no fat does not age: it dries out and is lost entirely.
Ageing
Dry-aged beef
Dry ageing does not «add» anything: it removes water and lets the muscle’s own enzymes break down protein. All the value lies in controlling three variables at once, and in accepting the weight loss.
Control parameters
| Variable | Value | Why |
|---|---|---|
| Temperature | 1 – 3 °C | Below 0 °C enzyme activity stalls; above 4 °C unwanted flora grows. |
| Relative humidity | 75 – 85 % | Less and you form an impenetrable crust; more and you get mould and slime. |
| Air speed | 0.5 – 2 m/s | Constant air dries evenly. Still air is what rots a chamber. |
| Cut | Bone-in with a fat cap | Fat and bone protect the muscle: you trim the crust, not the prime meat. |
Process
Step by step, with the temperatures.
Hang or rack
No contact between pieces or with surfaces. Air must circle all four sides.
Stabilise the chamber
1 – 3 °C, 80 % humidity, air moving continuously.
Age
21 to 45 days. At 28 days the butter-and-nut profile appears; past 45 the flavour turns intense and divides opinion.
Trim
Remove the dehydrated crust and any mould. This is the loss almost nobody accounts for when pricing.
Portion and pack
Vacuum packed, with batch record and chamber entry date.
| Control point | Value |
|---|---|
| Typical ageing | 21 – 45 days |
| Most requested commercial point | 28 days |
| Loss to evaporation | 10 – 18 % |
| Loss to crust trimming | 10 – 20 % |
| Total loss on the whole primal | 25 – 35 % |
| Chamber temperature | 1 – 3 °C |
Troubleshooting
What went wrong, and why.
Half the craft is reading the defect. These are the ones that keep coming back.
| What you see | What caused it |
|---|---|
| Excessive black hard crust | Humidity too low or airflow too fast. You lose usable meat. |
| Slime and ammonia smell | High humidity with still air. That batch is discarded: this is not a cosmetic defect. |
| Flavour far too strong | Too many days for the target market. The commercial ceiling usually sits at 45 days. |
| Unexpected financial loss | Trimming loss was not built into the price. It is the most expensive business mistake in dry ageing. |
Frequently asked
What people ask before they start.
Dry ageing or wet ageing?
Wet ageing (vacuum) tenderises just as well through enzyme action, but it does not concentrate flavour or lose water, so there is no shrink. Dry ageing costs more because you pay in weight loss, and in exchange you get the aromatic profile that justifies the price.
What loss should I actually price in?
Between 25 and 35 % on the whole primal, adding evaporation and trimming. If you price at fresh meat cost plus a margin, you lose money: the calculation is made on the final saleable kilo, not on the kilo that went into the chamber.
Will a converted domestic fridge do?
For your own consumption and at your own risk, with a hygrometer and a fan. For selling, no: there is no humidity control and no record, and with no record there is no traceability and no defence before a food authority.
Contact
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