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Fall-apart tender roasted lamb leg with yellow sauce being poured over, juicy and golden, ready to serve

Oven Roasted or Slow-Roasted Lamb Leg

Tender, flavorful oven-roasted lamb leg with classic herbs and optional garlic. Quick 2-hour roast for sliceable meat or 3.5–5 hour slow roast for pull-apart lamb — juicy, melt-in-your-mouth results every time.
Prep: 10–15 min | Cook: 2–5 hrs | Rest before serving.
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Author: Miranda | My Anosmic Kitchen
Prep 15 minutes
Cook Time 2 hours 30 minutes
Total Time 2 hours 45 minutes
Servings :6 servings

Equipment

  • Roasting Tray
  • Rack (for classic oven roast method)
  • Foil or lid (for slow roast method)

Ingredients
  

  • 1 leg of lamb approx. 2–2.5 kg / 4–5 lbs
  • 2-4 tbsp olive oil (see notes below)
  • 1 tsp salt
  • 1/2 tsp black pepper
  • 2-3 sprigs fresh rosemary chopped
  • 3-4 garlic cloves minced (optional)
  • 1 tsp dried thyme optional
  • 2 cups water or stock
  • 1 onion sliced (optional but recommended)

Instructions 

Step 1: Prep the Lamb

  • Remove lamb from fridge 30–60 minutes before cooking.
  • Rub all over with olive oil, salt, pepper, rosemary, garlic (optional), and thyme.

Step 2: Choose Your Cooking Method

    Method 1: Classic Oven Roast (Sliceable Meat, Uncovered)

    • Preheat oven to 200°C / 390°F.
    • Place sliced onion and water (or stock) in the base of a roasting tray. Set the lamb on top — the lamb may touch the liquid slightly, which is fine. The onions and liquid help prevent it from drying out.
    • Roast uncovered for 20 minutes at high heat. Oven temperatures vary, so watch the lamb carefully to avoid burning; some smoke is normal. It’s okay to remove it while lowering the temperature if needed.
    • Reduce oven to 180°C / 350°F and continue roasting until internal temperature reaches 60°C / 140°F for medium-rare, adjusting for size and preference.
    • Rest lamb 15–20 minutes before slicing.

    Method 2: Fall-Apart Slow Roast (Covered)

    • Preheat oven to 160°C / 320°F.
    • Place lamb directly in a tray with sliced onion and 1–2 cups of water.
    • Cover loosely with foil, allowing some steam to escape while keeping the lamb moist.
    • Roast 3.5–5 hours, until meat is very tender.
    • Rest 15–20 minutes before serving.

    Notes

    Notes (Quick Tips)

    • Garlic is optional; herbs keep it flavorful.
    • Onions + a little water or stock keep lamb moist — touching the liquid is fine.
    • Classic roast: 20 min high heat, then lower temp; watch carefully, some smoke is normal.
    • Slow roast: cover loosely to let steam escape, ensures pull-apart tenderness.
    • Rest 15–20 min before slicing for maximum juiciness.
    • Internal temps: Rare 55°C / 130°F, Medium-rare 60°C / 140°F, Well-done 70°C / 160°F.
    • Optional: splash of lemon or drizzle of honey for a golden finish.
    • Herbs: rosemary, thyme, parsley, or mint — tailor to taste.
    • Serve with roasted potatoes, seasonal veg, or a fresh salad.

    Nutrition

    Serving: 1servingCalories: 355kcalCarbohydrates: 2gProtein: 49gFat: 15gSaturated Fat: 5gPolyunsaturated Fat: 1gMonounsaturated Fat: 8gCholesterol: 152mgSodium: 538mgPotassium: 721mgFiber: 0.5gSugar: 1gVitamin A: 17IUVitamin C: 2mgCalcium: 25mgIron: 5mg
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