To cook a gammon joint, simmer then roast with a glaze or roast from raw, and check 70–75°C in the thickest part.
Gammon is cured pork from the hind leg, sold raw and cooked to become ham. If you’re asking “how do you cook gammon joint?” the two reliable routes are: boil then roast for a tender, juicy joint with a glossy finish, or straight roast for a simpler one-pan approach. The core steps are simple, timing rests on the weight, and food safety comes from hitting a safe core temperature. In the guide below you’ll find concise timings, temperature targets, glazing ideas, and smart tips for slicing, storing, and using leftovers.
Gammon Cooking Methods At A Glance
Weigh your joint first. Most home cooks follow a weight-based timing, then finish with a glaze. Use a thermometer to confirm doneness: UK guidance allows 70°C for 2 minutes, or equivalent time-temperature pairs, which is easy to achieve in a home oven. See the Food Standards Agency’s cooking temperature combinations for reference (70°C for 2 minutes).
| Method | Core Steps | Typical Timing |
|---|---|---|
| Boil Then Roast | Simmer in water with aromatics, then roast and glaze near the end. | Work out roast time at 20 min per 450 g + 20 min; boil for half of that, roast for the remainder (180°C / 160°C fan).* |
| Straight Roast | Cover with foil, roast until near target, uncover to glaze and color. | 20 min per 450 g + 20 min at 180°C / 160°C fan.* |
| Slow Cooker (Tender Finish) | Cook on low with a little liquid; finish under a hot oven with glaze. | Small joints 4–6 hrs on low; large joints 6–8 hrs; glaze in a 200°C oven for 15–20 min. |
| Pressure Cooker | Cook under pressure in stock; release, then glaze in the oven. | Guide: 15–20 min per 500 g at pressure as a starting point; check temp, then glaze. |
| Air Fryer | Roast a small joint, then brush on glaze for a sticky shell. | Commonly 160–180°C until temp is reached; glaze for the last 10–15 min. |
| Glaze Finish | Score fat, brush on glaze, roast hot to caramelise. | 200°C for 15–25 min, basting once or twice. |
| Safety Check | Probe in the thickest part; rest before carving. | Target 70–75°C (see UK temp guidance above). |
*Timing rule of thumb from BBC Good Food’s gammon guide (20 min per 450 g + 20 min).
How Do You Cook Gammon Joint? Step-By-Step Walkthrough
This is the classic boil-then-roast method for a juicy centre and a lacquered crust. It works for smoked or unsmoked joints and scales from 750 g to family-sized cuts.
Prep And Desalting
Most supermarket gammon needs no soaking. If your butcher says it’s salty, cover with cold water for 2–4 hours in the fridge, changing the water once. Pat dry before cooking.
Simmer For Tenderness
- Weigh the joint. Calculate the total roasting time as 20 minutes per 450 g, plus 20 minutes. Half of that will be your simmer time.
- Put the joint in a large pot. Add cold water to cover, plus onion, bay, peppercorns, and a splash of apple juice or cider if you like.
- Bring to a gentle simmer. Skim foam in the first 10 minutes. Keep it just burbling, not rolling.
- Simmer for half of your calculated total. Lift out and cool for a few minutes so it’s easier to handle.
Roast And Glaze
- Heat the oven to 180°C (160°C fan). Line a roasting tin with foil.
- Use a small knife to lift off the rind, keeping a thin, even layer of fat. Score the fat in a neat crosshatch.
- Cover loosely with foil and roast for the remaining time. Brush on your glaze 20–30 minutes from the end and remove the foil so it can color.
- Start checking the core temperature early with a clean probe thermometer. Aim for 70–75°C in the centre of the thickest part. The UK Food Standards Agency lists time-temperature options, with 70°C for 2 minutes being a simple target at home (FSA cooking temperatures).
- Rest 15–20 minutes on a warm board. This helps juices settle and makes carving cleaner.
Quick Straight-Roast Method
Skip the simmer if you want less washing up. Place the joint on a rack in a foil-lined tin, cover with foil, and roast for 20 minutes per 450 g + 20 minutes at 180°C (160°C fan). Remove the foil near the end, brush on glaze, and finish hot so the sugar bubbles and sets. Probe for 70–75°C before you rest and slice. BBC Good Food uses this timing rule across their gammon guide (roast timing).
Cooking A Gammon Joint In The Oven – Timing And Temperature
Timing by weight keeps things predictable. The oven’s steady heat shapes texture; the glaze brings shine and sweetness. The thermometer removes guesswork. Joints vary in shape, fat cover, and cure strength, so start checking early and trust the probe rather than the clock alone.
Reliable Glaze Formulas
- Honey-Mustard: 3 tbsp runny honey + 1½ tbsp coarse-grain mustard + 1 tbsp brown sugar.
- Maple-Dijon: 3 tbsp maple syrup + 1½ tbsp Dijon + 1 tbsp demerara sugar.
- Marmalade: 2 tbsp marmalade + 1 tbsp brown sugar + 1 tsp English mustard.
- Spiced Treacle: 1 tbsp black treacle + 2 tbsp brown sugar + pinch ground cloves.
Warm the glaze to loosen, brush on 20–30 minutes before the end, and baste once or twice. Turn the oven up to 200°C for the last 10–15 minutes to set the sheen without burning the sugars.
Pan Stock That Earns Its Keep
The simmering liquor is liquid gold. Strain it and use as stock for pea soup, braised cabbage, or a quick gravy. If it’s very salty, dilute with water before using. Chill and skim the set fat for roasting potatoes later.
How Much Gammon Per Person?
For a centrepiece, plan about 170–200 g raw gammon per person for a roast joint, less if you’re building a buffet with lots of sides. Leftovers are handy, so sizing up rarely goes to waste.
Weight-To-Time Examples Using The 20-Per-450 Rule
Use these worked examples to plan the clock. The split shows the simmer time first (if you choose to simmer) and the remainder as the roast phase. Always finish by checking temperature.
| Joint Weight | Total Roast-Only Time (180°C / 160°C fan) | Boil-Then-Roast Split |
|---|---|---|
| 1.0 kg | ~65 min (20 min × 2.2 + 20) | ~32 min simmer + ~33 min roast |
| 1.5 kg | ~85 min (20 min × 3.3 + 20) | ~42 min simmer + ~43 min roast |
| 2.0 kg | ~105 min (20 min × 4.4 + 20) | ~52 min simmer + ~53 min roast |
| 2.5 kg | ~125 min (20 min × 5.5 + 20) | ~62 min simmer + ~63 min roast |
| 3.0 kg | ~145 min (20 min × 6.6 + 20) | ~72 min simmer + ~73 min roast |
| 3.5 kg | ~165 min (20 min × 7.7 + 20) | ~82 min simmer + ~83 min roast |
| 4.0 kg | ~185 min (20 min × 8.8 + 20) | ~92 min simmer + ~93 min roast |
Boiling Tips For Better Texture
- Gentle Heat: Keep it just at a simmer. A rolling boil can tighten the meat.
- Aromatics: Onion, bay, peppercorns, celery, or a slice of orange add depth without stealing the show.
- Partial Cover: Lid ajar helps control the simmer and reduces foam.
- Lift And Rest: Give the joint a short rest after simmering so you can handle and score it neatly for glazing.
Roasting Tips For Even Results
- Foil First: Start covered so the joint heats evenly, then remove the foil to color and set the glaze.
- Rack And Tin: A rack stops the base from stewing; if you don’t have one, scrunch foil into a raft.
- Score Fat: Shallow diamonds help the glaze cling and render the fat layer gently.
- Thermometer: Probe early and in more than one spot to be sure the centre is ready.
Simple Air Fryer, Slow Cooker, Or Pressure Cooker Variations
Small boneless joints suit gadgets. In a slow cooker, cook with a splash of liquid until tender, then move to a hot oven with glaze to finish. Pressure cooking speeds up the tender stage; again, finish in the oven for color. An air fryer can roast a compact joint; apply glaze for the last 10–15 minutes. With all three, the end goal stays the same: a steady finish in the oven and a safe internal temperature.
Salting, Smoked Vs Unsmoked, And Flavour Balance
Smoked gammon brings a stronger savoury edge; unsmoked suits sweeter glazes. If you’re sensitive to salt, pick unsmoked, skip added salt during cooking, and taste the simmering liquor before using it as stock. Public health advice encourages cutting down on salt from cured meats; see the NHS quick guide to salt intake (salt in your diet) and balance your plate with greens, roots, and a fresh salad.
Carving, Serving, And Sides
Resting pays off. Sit the joint for 15–20 minutes on a warm board so slices stay juicy. For a bone-in joint, cut along the bone to release large pieces, then slice across the grain. For boneless, stand the joint on the flat end and slice thinly for sandwiches or thicker for a plated roast.
Side ideas that match the salty-sweet glaze:
- Roast potatoes or buttered new potatoes
- Peas, braised cabbage, or charred sprouts
- Pineapple rings roasted in the same tray
- Sharp sauces: English mustard, mustard-marmalade, or apple sauce
Leftovers You’ll Look Forward To
Cool leftovers fast, wrap, and chill for up to 4–5 days. Freeze slices or chunks for a month or two. Try pea and ham soup, ham-and-cheese scones, fried rice, omelettes, or a quick pasta with leeks and cream. The bone makes a fine stock with onions, celery, and bay.
Common Questions
Do You Always Need To Soak A Gammon?
Not usually. Modern cures are milder. If a pack or butcher mentions soaking, follow that advice. A short simmer and a taste of the cooking liquor will tell you if it’s still salty.
What Temperature Should I Aim For?
At home, a straightforward target is 70°C in the centre, held for 2 minutes; it lines up with the FSA’s core advice on cooking temperatures. Some cooks prefer 75°C for a quick safety margin. A probe thermometer makes this simple.
Can I Cook It Fully One Day And Glaze The Next?
Yes. Chill the cooked joint, then glaze and heat through in a 180–200°C oven until hot in the centre and the glaze has set. This spreads the work and helps with neat slices.
The Clean, Repeatable Plan
- Weigh: Note the weight to plan timing.
- Choose Method: Boil-then-roast for extra tenderness, or straight roast for fewer steps.
- Cook: Use the 20-per-450 rule and the split shown in the table if simmering.
- Glaze: Add the glaze 20–30 minutes from the end and finish hotter for shine.
- Check: Probe to 70–75°C in the thickest part, then rest.
- Slice And Serve: Carve across the grain and save the stock.
Where The Timing Rule Comes From
The widely used timing for roasted gammon—20 minutes per 450 g plus 20 minutes—comes from trusted UK cookery sources and is easy to apply at home. BBC Good Food’s step-by-step method uses the same rule and shows the common “boil for half, roast for the rest” approach for a tender result (gammon guide). Match that with a modern probe check against UK temperature guidance and you get consistent, safe results.
Final Notes For Confidence
If you landed here asking “how do you cook gammon joint?” you now have a tidy plan: weigh, time, glaze, and verify temperature. Keep the simmer gentle, the roast steady, and the finish hot enough to set the sugars without burning. With these steps, you’ll carve a juicy, rosy ham with a sweet-savory crust and leftovers that brighten breakfasts and lunches all week.
