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sliced leg of lamb on cutting board
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Roasted Boneless Leg of Lamb

This easy roasted boneless leg of lamb recipe is quick to prepare. The lamb leg is flavored with a marinade of olive oil, garlic, lemon juice and fresh rosemary leaves, before being roasted in the oven.
Course Main Course
Cuisine American
Keyword boneless leg of lamb recipe, roasted boneless leg of lamb
Prep Time 10 minutes
Cook Time 1 hour 20 minutes
Marinate 30 minutes
Total Time 2 hours
Servings 8
Calories 294kcal
Author Tanya

Ingredients

  • 1/4 cup olive oil
  • 6 cloves garlic
  • 3 Tablespoons fresh rosemary leaves
  • 2 Tablespoons lemon juice
  • 2 teaspoons kosher salt
  • 1/2 teaspoon black pepper
  • 5 lb boneless leg of lamb netted or wrapped in twine
  • yellow onion, garlic cloves, additional rosemary optional

Instructions

  • Add olive oil, garlic cloves, rosemary leaves, lemon juice, kosher salt, and black pepper to a mini food processor and process until smooth.
  • Pat the lamb dry and rub the mixture over the lamb, getting the mixture into the netting. Cover and let the lamb marinate in the refrigerator for up to 24 hours.*
  • Preheat the oven to 450 degrees Fahrenheit.
  • Place the lamb in a roasting pan, fat cap facing up. Roast the lamb at 450 degrees Fahrenheit for 15 minutes.
  • After 15 minutes, reduce the oven temperature to 325 degrees and continue roasting until the internal temperature of the lamb reaches your desired temperature (about 1 hour and 20 minutes for medium).
  • Remove the lamb from the oven and allow it to sit for 10-15 minutes. Remove the netting, slice, and serve.

Notes

  • Optional step: In a large cast iron skillet, add some onion, garlic cloves, rosemary, and about 2 Tablespoons of oil. Place the cast iron skillet in the oven for 10 minutes to get it nice and hot. When ready to roast the lamb, place the lamb on top of the hot skillet. This will give you delicious melted onions and garlic when done. You could also skip this step and roast your lamb in a roasting pan.
  • You can skip the long marination and allow the lamb to marinate for as little as 30 minutes. 
  • I recommend using a probe thermometer to monitor the temperature of the lamb while it is in the oven. 
  • Lamb Cooking Temps are as follows:
    • Rare: 115-120F
    • Medium rare: 125F
    • Medium: 130F
    • Medium-well: 145F
    • Well-done: 150F

Nutrition

Calories: 294kcal | Carbohydrates: 1g | Protein: 37g | Fat: 15g | Saturated Fat: 4g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 8g | Cholesterol: 114mg | Sodium: 693mg | Potassium: 536mg | Fiber: 0.2g | Sugar: 0.1g | Vitamin A: 23IU | Vitamin C: 2mg | Calcium: 18mg | Iron: 3mg