How to Cook a Sunday Roast in a Built-In Oven
Choosing Your Joint
Your built-in oven can handle any roasting cut, but the right choice depends on the number of people you are feeding, how long you have, and what flavour profile you are after. The guide below covers the most popular options for a traditional Sunday roast.
Rib, sirloin, or topside
Rich, deeply savoury flavour. Rib and sirloin are well-marbled and forgiving; topside is leaner and benefits from careful timing. Allow 225–250g per person. Can be served anywhere from rare to well done.
Whole bird
The most family-friendly option. A 1.5–2 kg bird feeds 4–6 comfortably. Mild flavour that pairs with almost any stuffing or herb. Must be cooked all the way through — no pink meat.
Leg or shoulder
Distinctive, robust flavour. Leg is suited to faster roasting and can be served pink; shoulder has more fat and collagen and is best slow-roasted until falling apart. Allow 250g per person on the bone.
Loin, shoulder, or belly
Sweet, succulent meat with the added prize of crackling if you get the skin prep right. Shoulder is excellent slow-roasted; loin cooks faster. Allow 200–225g per person. Must be cooked through.
Preparing the Meat
Good preparation before the joint goes into the oven is what separates a roast that merely works from one that is genuinely impressive. The three things that matter most are bringing the meat to room temperature, drying the surface, and setting up the tray correctly.
Temperature and drying
Remove the meat from the fridge 30–60 minutes before roasting. A cold joint placed directly into a hot oven takes longer to cook through, leading to an overcooked exterior by the time the centre reaches temperature. Pat the surface completely dry with kitchen paper: moisture on the surface creates steam, which inhibits browning. For pork crackling, dry the skin thoroughly and score it at close intervals — a sharp knife or a clean Stanley blade works well — before salting generously.
Seasoning
Season more generously than feels comfortable, particularly with salt. Beef benefits from a heavy coating of salt and cracked pepper applied right before cooking. Lamb takes well to garlic pushed into small incisions, plus rosemary and a little oil. Chicken responds to butter worked under the skin over the breast, with thyme and half a lemon in the cavity. For pork, focus the seasoning on the flesh rather than the skin, which will have its own salt applied separately.
Rack and tray setup
Always roast meat on a wire rack set inside a roasting tin, not sitting directly in the tray. Elevating the joint allows hot air to circulate underneath and prevents the base from stewing in its own juices. For chicken and other poultry, tuck the wings underneath and tie the legs together with kitchen string to encourage even cooking. If you are roasting vegetables at the same time, use a separate tray on a different shelf — fat and meat juices will make vegetables greasy and steamy rather than caramelised.
Oven Modes and Temperatures
Most modern built-in ovens offer several cooking modes. Understanding which to use for different stages of a roast makes a meaningful difference to the result.
Fan-assisted (fan oven)
The fan circulates hot air evenly around the cavity, resulting in more consistent temperatures across all shelves and faster cooking times than conventional heat. Fan is the best default mode for poultry, roast potatoes, and vegetables. When using fan mode, reduce the temperature by 20°C compared to conventional oven recipes.
Conventional (top and bottom heat)
Heat radiates from elements at the top and bottom of the oven. This produces a more intense heat in the centre of the oven and is preferred by many cooks for large beef and pork joints where deep browning of the surface is a priority.
Grill or grill with fan
Use this at the very end of cooking to finish pork crackling or to crisp up the skin on a chicken that has coloured unevenly. Watch it carefully — a grill can go from golden to burnt in under two minutes.
Roasting Timings by Meat
Use these as a planning guide rather than a guarantee. Ovens vary, joint shapes vary, and a thermometer will always give you a more reliable result than timing alone. The high-heat blast at the start is a fixed 20 minutes regardless of joint size; the per-kg times that follow are calculated at the reduced temperature.
| Doneness | Per kg at reduced temp | Target internal temp |
|---|---|---|
| Rare | 15 min/kg | 52°C |
| Medium rare | 20 min/kg | 57°C |
| Medium | 25 min/kg | 60°C |
| Well done | 30 min/kg | 71°C |
Rest for at least 20 minutes for small joints, 30 minutes for large. Tent loosely with foil. Internal temperature will rise a further 2–4°C during resting (carryover cooking) — remove the joint 2–3°C below your target.
| Weight | Cooking time | Target internal temp |
|---|---|---|
| 1–1.5 kg | 60–75 min + 20 min | 74°C at thickest part of thigh, not touching bone |
| 1.5–2 kg | 75–90 min + 20 min | |
| 2–2.5 kg | 90–105 min + 20 min |
Chicken must be cooked all the way through — no pink meat and juices must run clear from the thickest part of the thigh. A thermometer is the only reliable way to confirm this. Rest for 15–20 minutes before carving.
| Doneness | Per kg at reduced temp | Target internal temp |
|---|---|---|
| Pink (medium) | 20 min/kg | 60–65°C |
| Well done | 28–30 min/kg | 70°C+ |
| Slow-roast shoulder | 160°C (fan 140°C), 4–5 hours | 90°C+ (falling apart) |
Lamb leg can be served pink (like beef — bacteria are on the surface, not inside whole muscle). Slow-roast shoulder is a different technique entirely: low and slow until the collagen breaks down and the meat pulls apart easily. Rest for 20–30 minutes.
| Cut | Per kg at reduced temp | Target internal temp |
|---|---|---|
| Loin | 25 min/kg | 71°C (UK FSA guidance) |
| Shoulder (faster roast) | 30 min/kg | 71°C |
| Shoulder (slow roast) | 160°C (fan 140°C), 4–6 hours | 88–93°C (falling apart) |
The UK Food Standards Agency recommends pork reaches 71°C at the centre (or 70°C held for at least 2 minutes). Juices must run clear. For crackling: the initial high-heat period is critical — the skin must be bone dry, well scored, and salted. If crackling hasn’t blistered fully, finish under the grill for 3–5 minutes, watching closely. Rest for 15–20 minutes.
Internal Temperature Guide
A meat thermometerInsert into the thickest part of the joint, away from bone. Pull back slowly to find the lowest reading — that’s your true internal temperature. is the single most useful piece of equipment for a roast. It removes guesswork entirely and prevents the most common failure: overcooking. Probe the thickest part of the joint, away from bone, for an accurate reading.
| Meat | Doneness | Pull from oven at | Final (after rest) |
|---|---|---|---|
| Beef | Rare | 49–50°C | 52°C |
| Beef | Medium rare | 54–55°C | 57°C |
| Beef | Medium | 57–58°C | 60°C |
| Beef | Well done | 68°C | 71°C |
| Chicken must cook through | — | 71°C | 74°C (minimum) |
| Lamb | Medium (pink) | 60–62°C | 63–65°C |
| Lamb | Well done | 68°C | 70°C+ |
| Pork must cook through | — | 68°C | 71°C (UK FSA) |
Carryover cooking raises the internal temperature by 2–4°C after the joint is removed from the oven — account for this by pulling the meat out slightly before your final target temperature. Chicken and pork must always reach their minimum safe temperatures throughout; no pink is acceptable.
Roast Potatoes
The texture gap between a good roast potato and an ordinary one comes down almost entirely to three things: roughed-up surface starch, the correct fat, and a tray that is hot enough to sizzle the moment the potato hits it. Maris Piper and King Edward varieties are best for the floury interior that produces a crisp shell.
-
Peel and cut into even chunks
Cut to roughly the size of a golf ball or slightly larger. Uniformity matters — uneven sizes give uneven cooking.
-
Parboil in well-salted water
Bring a large pan of salted water to the boil and cook the potatoes for 8–10 minutes, until the edges are just beginning to soften. You want them parcooked, not falling apart.
-
Drain and steam-dry
Drain thoroughly, then return to the pan with the lid on and shake vigorously for 30 seconds. The edges should look rough and floury. Remove the lid and leave to steam-dry for 2–3 minutes — surface moisture is the enemy of crispness.
-
Preheat the tray and fat
Add beef dripping, goose fat, or a neutral oil to your roasting tray and put it in the oven at 200°C (fan) or 220°C (conventional) for at least 10 minutes. The fat must be shimmering and just beginning to smoke before the potatoes go in.
-
Add the potatoes, coat, and space out
Carefully tip the potatoes into the hot fat — they should sizzle immediately. Turn each piece to coat all sides. Leave generous space between them: crowding causes steaming rather than roasting.
-
Roast and turn once
Roast for 40–50 minutes at 200°C fan (45–55 minutes conventional at 220°C), turning once halfway through. They are ready when deeply golden and crisp on all sides with no pale patches.
Vegetables
Roasted vegetables need space and high heat to caramelise. Keep them on a separate tray from the meat — fat dripping from the joint makes veg greasy and steamy rather than caramelised at the edges. Fan-assisted mode at 190–200°C works well for most root vegetables.
| Vegetable | Preparation | Temp (fan) | Time |
|---|---|---|---|
| Carrots and parsnips | Peeled, cut into batons; toss with oil and season | 190°C | 35–45 min |
| Red onions | Cut into wedges; drizzle with oil and a little balsamic | 190°C | 30–40 min |
| Brussels sprouts | Halved; toss with oil and season | 200°C | 20–25 min |
| Tenderstem broccoli | Trim ends; toss with oil | 190°C | 12–15 min (add late) |
| Beetroot | Quartered; wrap in foil with a splash of water and thyme | 180°C | 45–60 min |
Add delicate vegetables like broccoli and asparagus to the oven in the last 12–15 minutes rather than roasting them alongside root vegetables, which need much longer. Swap your vegetable tray to the top shelf for the final 10 minutes to boost caramelisation.
Gravy from the Roasting Tin
Good gravy is built on the fondThe browned, caramelised deposits left on the bottom of the roasting tin after cooking — these contain concentrated flavour that forms the base of a great gravy. left in the roasting tin. Do not discard the tin or wipe it out. The method works for any meat.
-
Pour off excess fat
Tip the roasting tin carefully and spoon off most of the fat, leaving behind the dark, sticky juices. Leave a tablespoon or so of fat in the tin — you need it to cook the flour.
-
Deglaze
Set the tin over medium heat on the hob. Add a splash of wine, cider, or stock and scrape up all the browned bits from the base using a wooden spoon. This is the flavour foundation of the gravy.
-
Add flour and cook out
Stir in 1–2 tablespoons of plain flour. Cook, stirring constantly, for about 1 minute to eliminate the raw flour taste.
-
Build with stock
Gradually whisk in 500–700 ml of hot stock (matching the meat where possible: chicken stock with chicken, beef stock with beef). Simmer for 5–8 minutes, stirring, until reduced to a glossy consistency.
-
Finish and strain
Taste and season. Add any resting juices from the meat. Strain through a sieve into a warm jug for a smooth, glossy gravy. If it tastes thin, simmer longer. If it is too intense, add a splash of hot water and whisk in a small knob of butter.
Yorkshire Puddings
Yorkshire puddings rise because cold batter hits smoking-hot fat, creates a burst of steam, and sets quickly in a very hot oven. The ratio is simple; the technique is unforgiving about two things: the fat temperature and keeping the oven closed during baking.
eggs : flour : milk
- Whisk equal volumes of beaten eggs, plain flour, and full-fat or semi-skimmed milk together with a generous pinch of salt until completely smooth. Rest in the fridge for 30–60 minutes minimum — a cold batter hitting hot fat produces a better rise.
- Add half a teaspoon of lard, beef dripping, or a neutral oil with a high smoke point to each well of a 12-hole muffin tin. Put the tin in the oven at 220–230°C (fan 200–210°C) for 10 minutes until the fat is shimmering and just starting to smoke.
- Working quickly, fill each hole to no more than two-thirds full. Return the tin to the top shelf of the oven immediately.
- Bake for 18–22 minutes. Do not open the oven door during the first 15 minutes — the steam is what drives the rise, and cold air will collapse the puddings.
Oven Sequence: Getting Everything to the Table Together
The most stressful part of a roast is coordinating multiple things finishing at the same time. The timeline below is built around a 1.5 kg chicken as the centrepiece — adjust the anchor times if you are cooking a different joint using the timings above.
−90
Make the Yorkshire pudding batter
Mix and refrigerate. The longer the batter rests, the better the rise.
−75
Preheat oven; prepare and season the joint
Remove meat from the fridge. Season and set up on a rack. Preheat to your starting temperature.
−60
Meat goes in; parboil potatoes
Start the chicken. While it heats, parboil your potatoes, then drain and steam-dry.
−45
Preheat roasting tray; add potatoes
Heat fat in a separate tray for 10 minutes, then add the roughed-up potatoes. They go into the oven below the chicken.
−30
Root vegetables in
Prepare and season carrots, parsnips, and onions. Add to a third tray on the bottom shelf.
−20
Check the chicken with a thermometer
Probe the thickest part of the thigh. Target is 74°C. If it is not there yet, continue cooking and check every 5–10 minutes.
0
Chicken out to rest; Yorkshire pudding tin into oven
Remove the chicken and tent loosely with foil. Raise the oven to 220°C fan. Heat the fat for the Yorkshire puddings for 10 minutes, then pour in the batter.
+20
Yorkshire puddings out; everything to the table
Potatoes and veg should be done or close. Make the gravy in the resting tin. Carve the chicken. Serve immediately.
Common Mistakes to Avoid
- Skipping the preheat. Placing meat in an under-temperature oven means the initial searing effect is lost and cooking times become unpredictable. Always preheat for at least 15 minutes.
- Not using a thermometer. Timing alone is unreliable — oven temperatures vary, joint shapes vary, and starting temperatures vary. A thermometer is the only way to know for certain when meat is safely cooked to your preferred doneness.
- Not resting the meat. Carving immediately after the oven releases the juices onto the board rather than redistributing them through the meat. Small joints need 15 minutes; large joints 25–30 minutes.
- Ignoring carryover cooking. Large joints continue rising in temperature by 2–4°C after removal. Pull meat out 2–3°C below your target to account for this.
- Crowding the potatoes. Potatoes need space to roast rather than steam. Use two trays if necessary, and never stack them.
- Opening the oven during Yorkshire puddings. Even 30 seconds of cold air in the first 15 minutes will cause them to collapse. Check through the glass; do not open the door.
- Roasting veg under the meat. Fat dripping from the joint makes vegetables greasy and impedes caramelisation. Always use a separate tray on a separate shelf.
- Wet skin on pork or chicken. Surface moisture creates steam, which prevents browning and crisping. Pat completely dry before seasoning.
Frequently Asked Questions
Key Takeaways
- Always preheat for at least 15 minutes and use a meat thermometer — timing alone is not reliable enough for safe, consistent results.
- Account for carryover cooking: pull meat out 2–3°C below your target internal temperature and rest it properly before carving.
- UK Food Standards Agency guidance: chicken must reach 74°C throughout; pork must reach 71°C. Beef and lamb joints can be served pink — bacteria sit on the surface, which is seared during cooking.
- Roast potatoes: parboil, steam-dry, rough the edges, and always add to a preheated tray with smoking-hot fat. Never crowd the tray.
- Yorkshire puddings need cold batter, smoking-hot fat, and an unopened oven door for the first 15 minutes. Bake while the meat rests.
- Keep meat and vegetables on separate trays — fat dripping on vegetables prevents caramelisation.
- Plan your sequence in reverse from the time you want to serve: work back from the table, not forward from when you start.
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