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Lamb Sirloin Roast

  • Author: Maxine Dubois
  • Total Time: 1 hour 40 minutes
  • Yield: 6-8 servings 1x


This Lamb Sirloin Roast is made with bone-in roasted leg of lamb flavored with garlic, olive oil, fresh rosemary, lemon juice and red wine. 


  • 4 to 5 trimmed bone-in leg of lamb
  • 4 cloves garlic, crushed into a paste
  • 3 tablespoons olive oil
  • 1 tablespoon chopped fresh rosemary
  •  1 tablespoon lemon juice
  • 1/3 cup red wine
  • 1 tablespoon kosher salt
  • 2 teaspoons ground black pepper


  1. Preheat the oven to 350 degrees F. Line a roasting pan or a deep cast iron with aluminum foil.
  2. Crush the garlic into a paste with a mortar and pestle. If you don’t have one, you can use a coffee mug and a cutting board or a Ziplock bag and a blunt object.
  3. Pat the lamb dry with paper towels.
  4. In a bowl, combine the garlic, olive oil, rosemary, Lemon Juice, salt and pepper.
  5. Place the lamb leg on top of the roasting pan and massage the leg with the  rosemary mixture. Pour the wine over the leg and roast in the oven for 1 hour 30 minutes to 1 hour 45 minutes, until the leg reaches an internal temperature of 135 degrees F. Let the leg rest for 15 minutes before slicing. It keeps cooking when it rests!


  • Optional: Score the lamb and stick crushed garlic into the cuts. This gives the lamb extra flavor and is so delicious.
  • Important: Make sure to let the lamb rest for 15 minutes before slicing!
  • Prep Time: 10 minutes
  • Cook Time: 1 Hour 30 minutes
  • Category: Dinner
  • Method: Baking
  • Cuisine: American


  • Serving Size: 1
  • Calories: 126.9
  • Sugar: 0.0 g
  • Sodium: 15.5 mg
  • Fat: 9.3 g
  • Saturated Fat: 2.0 g
  • Carbohydrates: 5.1 g
  • Fiber: 2.7 g
  • Protein: 8.1 g
  • Cholesterol: 27.3 mg