Garlic Rosemary Roast Lamb

Featured in: Seasonal Roasts

This garlic and rosemary roast leg of lamb offers a tender, juicy centerpiece for any elegant meal. The lamb is seasoned with a fragrant mix of garlic, fresh rosemary, thyme, lemon zest, and olive oil, then slow roasted atop a bed of onions, carrots, and celery to infuse rich, aromatic flavors. The roasting process ensures a perfectly cooked, medium-rare interior that rests beautifully before carving. Ideal for special occasions or family dinners, the flavorful meat pairs wonderfully with roasted vegetables and pan juices, creating a satisfying and aromatic culinary experience.

Updated on Thu, 13 Nov 2025 15:13:00 GMT
Golden, roasted Garlic and Rosemary Roast Leg of Lamb, perfectly cooked and ready to carve. Save
Golden, roasted Garlic and Rosemary Roast Leg of Lamb, perfectly cooked and ready to carve. | birchplate.com

A succulent, aromatic roast leg of lamb infused with garlic and fresh rosemary for a classic, elegant centerpiece perfect for any special occasion.

I made this for our holiday dinner last year and the aroma filled the whole house with anticipation, turning a simple meal into a cherished family memory.

Ingredients

  • Bone-in leg of lamb (2-2.5 kg / 4.5-5.5 lb): Trimmed for roasting
  • Garlic (6 cloves): Peeled and sliced
  • Fresh rosemary leaves (3 tbsp): Chopped
  • Fresh thyme leaves (2 tbsp): Adds herbal flavor
  • Coarse sea salt (2 tsp): For seasoning
  • Freshly ground black pepper (1 tsp): To taste
  • Olive oil (1/4 cup): For marinade
  • Lemon zest: Zest of 1 lemon for brightness
  • Lemon juice: Juice of 1 lemon
  • Vegetables (optional): 2 large onions (thickly sliced), 2 large carrots (chunked), 2 stalks celery (chunked) as roasting bed

Instructions

Preparation:
Preheat oven to 200°C (400°F). Pat lamb dry. Cut small incisions over lamb with a sharp knife.
Marinade:
In a bowl, mix garlic, rosemary, thyme, salt, pepper, olive oil, lemon zest, and lemon juice.
Seasoning:
Rub marinade over lamb, pressing garlic and herbs into incisions.
Vegetable bed:
Spread onions, carrots, and celery on bottom of roasting pan. Place lamb on top.
Roasting:
Roast for 1 hour 30 minutes (medium-rare: internal temp 55–60°C / 130–140°F), basting with juices. Adjust time as needed.
Resting:
Remove, tent with foil, rest 15 minutes.
Serving:
Slice and serve with roasted vegetables and pan juices.
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This lamb roast takes center stage every Easter at our family table, remembered fondly in stories and photos year after year.

Serving Suggestions

Pair slices of roast lamb with simple roasted potatoes and a Greek salad for a complete Mediterranean feast.

Substitutions

Oregano can substitute for thyme to introduce a different herbal note, and leftover lamb makes great sandwiches.

Allergen Information

This recipe contains none of the major allergens, but always double-check if you have specific allergies.

A close-up of a tender Garlic and Rosemary Roast Leg of Lamb, surrounded by roasted vegetables. Save
A close-up of a tender Garlic and Rosemary Roast Leg of Lamb, surrounded by roasted vegetables. | birchplate.com

Enjoy this impressive roast with friends and family—it turns any occasion into something memorable.

Recipe Questions & Answers

How should I prepare the lamb before roasting?

Pat the leg of lamb dry and make small incisions all over to allow the garlic and herbs to penetrate deeply into the meat.

Can I marinate the lamb ahead of time?

Yes, marinating the lamb for up to 24 hours in the refrigerator enhances the depth of flavor and tenderness.

What internal temperature ensures the lamb is medium-rare?

Roast until the internal temperature reaches 55–60°C (130–140°F) for a perfect medium-rare finish.

What vegetables work well when roasting the lamb?

Onions, carrots, and celery create a flavorful bed that adds moisture and complements the lamb during roasting.

What herbs can be substituted in this dish?

Thyme can be replaced with oregano for a slightly different herbal aroma while maintaining a Mediterranean essence.

Garlic Rosemary Roast Lamb

Succulent leg of lamb roasted with garlic, rosemary, and herbs for a tender, flavorful main course.

Prep Duration
20 minutes
Time to Cook
90 minutes
Overall Time
110 minutes
Created by Elena Hart

Section Seasonal Roasts

Skill Level Medium

Cuisine Type Mediterranean

Servings produced 6 Serving Size

Diet Details No Dairy, Wheat-Free, Reduced Carb

What You'll Need

Meat

01 1 bone-in leg of lamb, trimmed, 4.5 to 5.5 lb

Marinade & Seasonings

01 6 cloves garlic, peeled and sliced
02 3 tbsp fresh rosemary leaves, chopped
03 2 tbsp fresh thyme leaves
04 2 tsp coarse sea salt
05 1 tsp freshly ground black pepper
06 1/4 cup olive oil
07 Zest of 1 lemon
08 Juice of 1 lemon

Vegetables (optional)

01 2 large onions, thickly sliced
02 2 large carrots, cut into chunks
03 2 stalks celery, cut into chunks

Step-by-Step Guide

Step 01

Preheat Oven: Set oven to 400°F to ensure proper roasting temperature.

Step 02

Prepare Lamb: Pat the leg of lamb dry with paper towels and make small incisions evenly across the surface using a sharp knife.

Step 03

Combine Marinade: In a mixing bowl, blend garlic, rosemary, thyme, sea salt, black pepper, olive oil, lemon zest, and lemon juice to form a herb marinade.

Step 04

Apply Marinade: Massage the marinade thoroughly into the lamb, pressing garlic and herbs into each incision for maximum flavor infusion.

Step 05

Prepare Roasting Bed: Arrange sliced onions, carrots, and celery at the base of a large roasting pan to create a vegetable bed and position the lamb on top.

Step 06

Roast Lamb: Cook the lamb in the preheated oven for 1 hour and 30 minutes for medium-rare doneness (internal temperature 130–140°F), basting once or twice with pan juices for moisture retention. Adjust timing for preferred doneness.

Step 07

Rest the Meat: Remove the lamb from the oven and cover loosely with foil. Let rest for 15 minutes to allow juices to redistribute before carving.

Step 08

Carve and Serve: Slice the lamb and serve alongside the roasted vegetables and pan juices for a complete dish.

Tools Needed

  • Sharp chef's knife
  • Large roasting pan
  • Small mixing bowl
  • Basting brush or spoon
  • Meat thermometer
  • Cutting board

Allergy Details

Review all components to spot allergies and check with a doctor if you're unsure.
  • Contains no major allergens; verify ingredients for potential cross-contamination.

Nutrition Breakdown (each serving)

Nutritional info is for reference. Please consult your doctor for specifics.
  • Energy (Calories): 510
  • Fats: 34 g
  • Carbohydrates: 8 g
  • Proteins: 43 g