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Perfect Herb-Crusted Roasted Lamb with Rosemary Jus

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A simple yet impressive herb-crusted roasted lamb recipe featuring a crispy herb crust and a savory rosemary jus, perfect for cozy dinners and special occasions.

Ingredients

  • Lamb Leg Roast (4-5 pounds, bone-in)
  • Fresh Rosemary (3 tablespoons, finely chopped)
  • Fresh Thyme (2 tablespoons, leaves only)
  • Garlic (4 cloves, minced)
  • Olive Oil (3 tablespoons, extra virgin preferred)
  • Sea Salt (1 tablespoon, coarse or flaky)
  • Black Pepper (1 teaspoon, freshly cracked)
  • Dijon Mustard (2 tablespoons)
  • Beef or Lamb Stock (1 cup / 240 ml, low-sodium)
  • Red Wine (½ cup / 120 ml, optional)
  • Butter (2 tablespoons)

Instructions

  1. Preheat your oven to 375°F (190°C). Let the lamb sit at room temperature for 30 minutes before roasting.
  2. Score the fat cap on the lamb leg with a sharp knife, making shallow diagonal cuts about 1/2 inch apart.
  3. In a mixing bowl, combine finely chopped rosemary, thyme leaves, minced garlic, sea salt, black pepper, and olive oil. Stir until well mixed and fragrant.
  4. Brush Dijon mustard all over the lamb, covering the fat and sides evenly. Press the herb mixture onto the mustard-coated lamb, patting firmly to create a crust.
  5. Place the lamb fat side up on a roasting rack inside your pan. Roast for about 1 hour 15 minutes to 1 hour 30 minutes, aiming for an internal temperature of 135°F (57°C) for medium-rare.
  6. Remove the lamb from the oven and cover loosely with foil. Let it rest for 15 minutes.
  7. Make the rosemary jus by placing the roasting pan on the stove over medium heat. Add red wine (if using) and scrape up browned bits. Pour in stock and add a sprig of fresh rosemary. Simmer until reduced by half, then whisk in butter.
  8. Slice the lamb against the grain, pour over the jus, and serve.

Notes

Let the lamb rest after roasting to lock in juices. Use a meat thermometer to avoid overcooking. Tent with foil if crust browns too quickly. Fresh herbs are preferred for best flavor. For gluten-free, ensure stock is gluten-free. Variations include adding mint or spicy herbs, or making a slow cooker version.

Nutrition

Keywords: herb-crusted lamb, roasted lamb, rosemary jus, easy lamb recipe, Sunday roast, lamb leg roast, cozy dinner

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