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Roast Lamb Leg with Root Vegetables

Roast leg of lamb with root vegetables produces carveable meat rather than the pull-apart texture of a slow shoulder braise. Garlic, rosemary and thyme flavour the joint, while vegetables roast in the surrounding juices. Resting is part of the serving sequence.

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Cuisine: Main Course Prep: 25 Min Cook: 110 Min Total: 135 Min Difficulty: Medium Servings: 4 servings
Roast Lamb Leg with Root Vegetables
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Follow the measured ingredients, numbered method, substitutions, safety notes and cooking mode below.

About This Recipe

Roast leg of lamb with root vegetables produces carveable meat rather than the pull-apart texture of a slow shoulder braise. Garlic, rosemary and thyme flavour the joint, while vegetables roast in the surrounding juices. Resting is part of the serving sequence.

Before You Start

1. Read firstRead every step once before switching on the cooker.

2. MeasureWeigh and prepare all ingredients in the order listed.

3. Control heatLow means a gentle bubble, medium cooks steadily, and high is for quick browning.

4. Check donenessUse the texture, timing and safe-temperature checks written in the method.

Equipment

  • ✓ Roasting tin
  • ✓ Rack
  • ✓ Foil
  • ✓ Food thermometer

Ingredients

Easy Step-by-Step Method

Complete one numbered step before moving to the next. Keep the heat and timing exactly as written.

  1. Prepare the lamb: Bring the lamb out 45 minutes before roasting, score the fat lightly and rub with garlic, rosemary, thyme, lemon, oil, salt and pepper.
  2. Start hot: Roast at 220°C conventional / 200°C fan for 20 minutes to colour the exterior.
  3. Add the vegetables: Reduce to 180°C conventional / 160°C fan, arrange seasoned root vegetables around the lamb and pour stock into the tray.
  4. Roast to doneness: Continue cooking, turning vegetables twice, until the thickest flesh reaches at least 63°C, with the thermometer clear of bone.
  5. Rest the joint: Transfer lamb to a board, cover loosely and rest for at least 20 minutes.
  6. Finish the tray: Return vegetables to the oven if needed, reduce the pan juices, then carve the lamb across the grain and serve together.

Chef Notes & Tips

Root vegetables need large, even pieces so they brown without collapsing during the lamb cooking time.

Ingredient choices: A bone-in leg varies in thickness, so check more than one thick area. Cut potatoes, carrots and parsnips for their relative cooking times. Do not assume the shoulder’s long braising method applies to this leaner joint.

Cooking control: Roast with sufficient space for vegetables and check lamb temperature away from bone. Follow the safe whole-lamb temperature and rest guidance. Remove or continue cooking vegetables separately if they finish at a different time from the meat.

If something goes wrong: Dry slices may come from overcooking or carving without a rest. Pale vegetables can be finished separately while the lamb rests. If the tray dries out, add a small amount of hot stock before the residue scorches.

Ingredient Substitutions

  • ↔ Bone-in leg → boneless rolled lamb leg; adjust cooking time
  • ↔ Parsnips → celeriac or sweet potato
  • ↔ Lamb stock → chicken stock

Food Safety & Doneness

For intact lamb chops and roasts, reach at least 63°C and rest for 3 minutes. Shoulder and other braising cuts need longer to become tender. Use separate raw-meat utensils.

Serving & Plating

Carve across the muscle grain in manageable sections and serve with the vegetables and tasted juices. Account for the bone when judging portions from the raw joint weight.

Storage

Refrigerate promptly in shallow covered containers at 4°C or below and use within 3 days. Reheat only the portion needed to at least 74°C throughout. Discard food left unrefrigerated for more than 2 hours, or 1 hour above 32°C.

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