Take your 1 pcs beef sirloin out 20 minutes before cooking.
Trim the silverskin lightly, but keep the fat cap. Score the fat very shallowly in a diamond pattern.
Rub the whole sirloin with 2 tbsp coarse salt (ideally dry-brine uncovered in the fridge for 4–24 hours for extra even seasoning), or at least 30 min. before cooking.
Pat the surface completely dry.
Rub with 1 tbsp olive oil and 1 tsp freshly ground black pepper.
Preheat & Place
Preferably preheat the air fryer for 5 min at 200 °C.
Place the sirloin on the rack with the fat side up and airflow all the way around.
Brown
Roast Start onlinekøkken uret her at 200 °C to set the colour and start rendering the fat.
Main Roasting
Lower the temperature to 150–160 °C and continue roasting until the core temperature reaches:52–54 °C (rare/pink)55–57 °C (pink/medium)58–60+ °C (more well done)The main roasting typically takes 20–35 min after browning. Check the temperature for the first time after Start onlinekøkken uret her and then every 5 min. Do not turn – keep the fat side facing up the whole time.
Rest
Take the sirloin out 1–2 °C before your target temperature, place it on a rack/board and let it rest for 15–20 min(optionally with a small knob of 20 g butter and 1 bunch rosemary / 1 clove garlic on top).Do not cover it – this keeps the crust intact.
Slice & Serve
Slice against the grain into thin, angled slices.Serve immediately – ideally with creamy potatoes, green beans or a bitter salad.
Notes
Pro tip! (crust boost): Chill the outside for 8–10 min in the freezer after resting, then give it 2–3 min at 220 °C in the air fryer for extra crispy fat without overcooking the centre.
Fit: Always use the rack/insert with free airflow around the roast for even heat.
Flavour: Keep the seasoning simple (salt/pepper) and finish with browned butter, rosemary and a little garlic at the end.