How to Make a Perfect Lamb Roast
There are few meals more comforting and impressive than a perfectly cooked lamb roast. Whether you are preparing a Sunday dinner for the family or hosting guests, roast lamb is a timeless centrepiece that pairs beautifully with rich gravy, seasonal vegetables, and of course, mint jelly sauce.
In this guide, we’ll show you how to make a perfect lamb roast from start to finish, including cooking tips, timings, and how to serve it for maximum flavour.
Choosing the Right Cut of Lamb
For the best roast lamb, we recommend:
- Leg of Lamb – Classic roasting joint, lean and tender
- Shoulder of Lamb – Richer flavour, ideal for slow roasting
- Rack of Lamb – Premium option for smaller gatherings
Choose a quality cut with a good layer of fat for moisture and flavour. For this recipe, we'll be using a leg of lamb, follow the above links for more information about roasting Shoulder or Rack of lamb.
Ingredients You’ll Need
- 1 leg of lamb (approx. 2kg)
- 4 garlic cloves
- Fresh rosemary
- Olive oil
- Salt and black pepper
- Seasonal vegetables for roasting
- Gravy
- Mint jelly sauce for serving
Step 1: Prepare the Lamb
Remove the lamb from the fridge 30–60 minutes before cooking to bring it to room temperature.
- Score the fat lightly with a knife
- Rub with olive oil, salt, and pepper
- Insert sliced garlic and rosemary into small cuts in the meat
This helps the flavour infuse throughout the lamb during roasting.
Step 2: Roast to Perfection
Cooking times will vary depending on your preferred doneness:
- Rare: 20 mins per 500g + 20 mins
- Medium: 25 mins per 500g + 25 mins
- Well Done: 30 mins per 500g + 30 mins
Cook at 190°C / 170°C fan / Gas Mark 5
Use a meat thermometer if possible:
- Rare: 50–55°C
- Medium: 60–65°C
- Well Done: 70°C+
Step 3: Rest the Meat
Once cooked, cover the lamb loosely with foil and leave to rest for 15–20 minutes.
This allows the juices to redistribute and keeps the meat tender.
Step 4: Serve With Traditional Sides
A classic lamb roast works beautifully with:
- Roast potatoes
- Honey glazed carrots
- Green beans
- Yorkshire puddings
- Rich gravy
And of course…
Why Mint Jelly Sauce Is the Perfect Pairing
The sweetness and freshness of mint jelly sauce cuts through the richness of lamb beautifully, adding balance and brightness to every bite.
At Sam the Jam, our handcrafted mint jelly is made in small batches to create the perfect accompaniment for roast lamb, cheese boards, and even slow-cooked dishes.
Final Tips for the Perfect Lamb Roast
- Always let the meat come to room temperature first
- Rest the lamb before carving
- Don’t overcook — lamb is best slightly pink
- Use quality mint jelly for the best flavour pairing
Looking for the Perfect Mint Jelly Sauce?
Discover Sam the Jam’s handcrafted mint jelly — made in small batches and perfect for roast dinners, cheese boards, and more.
