Slow Roast Leg of Lamb

Slow roasting is a cooking technique that results in a tender, juicy and flavorful lamb dish that will impress your guests. The leg of lamb is a perfect cut for this cooking method, as it is a large and flavorful piece of meat that can be slow cooked to perfection. In this recipe, we will show you how to slow roast a leg of lamb with herbs and spices for a delicious and flavorful result.


— Ingredients :


▢2.25 kg / 4.5 lb leg of lamb , bone in (or shoulder)

▢Salt and pepper

▢1.5 tbsp olive oil

▢1 whole garlic head , unpeeled, cut in half horizontally

▢1 onion , quartered (unpeeled is fine)

▢2 rosemary sprigs (2 = whisper of rosemary flavour, 4 sprigs = stronger flavour)

▢3 cups beef stock/broth , low sodium (or homemade)

▢2 cups water




▢4 tbsp flour (white)

▢1 cup water

▢Salt and pepper , to taste


— Preparation :



Preheat oven to 170°C/335°F (standard) or 150°C (fan).

Place garlic, onion and rosemary in a metal roasting pan.

Season lamb: Place lamb leg right side up in the pan. (Note 2) Sprinkle generously with salt and pepper and rub it in.

Turn lamb over and place it so it mostly sits on the garlic and onion. Sprinkle with more salt and pepper, rub it in. (Video helpful here)

Add liquids and cover: Drizzle lamb with olive oil. Pour broth and water around the lamb – it won’t cover it, that’s ok, the lamb sinks into it. Cover with foil (don’t use a lid, you want a bit of liquid to steam out).

Slow roast: Place in the oven and roast for 4.5 hours. (See Notes for roasting time table)

Check meat: Remove from the oven, remove foil. Turn lamb over. Check it to ensure the meat is tender enough to pry a bit off easily with a fork. If not, return, covered, to oven.



Brown lamb: Return uncovered lamb to oven for a further 45 minutes or until well browned.

Rest: Remove lamb, spoon over pan juices generously. Transfer to serving platter, cover loosely with foil while you make the gravy (stays warm for 1 – 1.5 hours).


Skim fat: Use a large spoon to skim off and discard some of the fat from the surface of the liquid.

Add flour: Place pan on the stove on medium high. When the liquid bubbles, add flour. Use a whisk to mix it in – this may take a few minutes as the liquid reduces.

Add water: Once it looks like sludge (see video), whisk in 1/2 – 1 cup of water until it becomes a gravy consistency to your taste. Adjust salt and pepper to taste – I rarely add extra salt.

Strain gravy into a bowl, pressing juices out of the onion etc. Pour gravy into jug.


The meat is tender so you will only need tongs to tear the meat off. Serve with gravy!



Recipe Notes:


  • If you don’t have fresh herbs, you can use dried herbs instead. Use about 1/3 of the amount called for in the recipe if using dried herbs.
  • If you want a crispier crust on the lamb, remove the foil cover for the last 30 minutes of cooking.
  • You can use either chicken or beef broth in this recipe. Both will add flavor to the lamb.
  • Leftover lamb can be stored in an airtight container in the refrigerator for up to 3 days.



Nutrition Information:


This recipe makes about 8 servings. Each serving contains approximately:


Calories: 450

Protein: 53g

Fat: 23g

Carbohydrates: 2g

Fiber: 0g

Sugar: 0g

Sodium: 1350mg


Lamb is a good source of protein and contains important vitamins and minerals such as iron and vitamin B12. However, it is also high in saturated fat and cholesterol, so it should be consumed in moderation as part of a balanced diet.


Overall, this slow roast leg of lamb recipe is a delicious and impressive dish that is perfect for special occasions or family dinners. The combination of herbs and spices creates a flavorful and juicy lamb that is sure to impress your guests.



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