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water bath lamb roast

Water Bath Lamb Leg Roast (with Lamb Rub)

Tender, juicy lamb every time! A foolproof water bath method with fresh herbs and a special lamb rub creates melt-in-your-mouth results—perfect for Sunday lunches, holiday dinners, or any roast occasion.
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Author: Miranda | My Anosmic Kitchen
Prep 15 minutes
Cook Time 1 hour 30 minutes
Total Time 2 hours 15 minutes
Servings :6 servings

Ingredients
  

  • 2 Kg Lamb leg (front end, bone-in)
  • 4 Tbsps Extra Virgin Olive OIl
  • 2-3 Tbsps Lamb Rub/Seasoning
  • 4 Tbsps Fresh rosemary chopped heaped
  • 1 Tbsp Fresh thyme chopped
  • 3 Tbsps Salt and pepper mix, divided or to taste
  • 6 Cups Water divided

Instructions 

Bring Lamb to Room Temperature:

  • Take the lamb out of the fridge 1–1½ hours before cooking.

Preheat Oven & Prepare Water Bath:

  • Preheat the oven to 220°C / 425°F. Place a tray with 4 cups of water on the oven floor so it heats as the oven preheats.

Set Up Rack or Vegetable Bed:

  • Place a roasting rack over the tray. If you don’t have a rack, create a vegetable bed using potatoes, carrots, onions, celery, and garlic. (See notes on using foil as a bed.)

Prepare Herb & Rub Mixture:

  • In a small jug, combine olive oil, lamb rub, rosemary, thyme, and 1 tbsp of the salt & pepper mix. Stir until well combined.

Dry & Season the Lamb:

  • Pat the lamb dry thoroughly with kitchen tissue. Rub the herb-oil and lamb rub mixture all over the lamb, coating evenly.

Add Remaining Water to Tray:

  • Pour the remaining 2 cups of water into the tray from the side, making sure it does not touch the lamb.

High-Heat Roast:

  • Roast the lamb at 220°C / 425°F for 20 minutes to develop a golden crust.

Lower Temperature & Continue Roasting:

  • Reduce the oven to 180°C / 350°F. Roast for 50–60 minutes, or until an instant-read thermometer registers 53°C / 127°F for medium-rare (adjust based on your oven and desired doneness).

Rest Before Carving:

  • Remove from the oven and cover loosely with foil. Rest for 30–60 minutes. The internal temperature will rise slightly as it rests, keeping the lamb juicy and tender.

Notes

Temperature Guide for Doneness

  • Rare: 49°C / 120°F
  • Medium-Rare: 53°C / 127°F
  • Medium: 57°C / 135°F
  • Medium-Well: 60°C / 140°F
  • Well-Done: 65°C / 150°F

Expert Tips

  • Dry lamb well: Moisture prevents browning.
  • Use a thermometer: Ensures perfect doneness.
  • Don’t skip the water bath: Steam keeps lamb juicy.
  • Rest fully: Key to tender slices.

Variations

  • Garlic Version: Add crushed garlic to the oil mixture.
  • Spicy Roast: Include chili flakes or harissa.
  • Veggie Bed: Use carrots, onions, celery, and garlic if no rack.
  • Smoky Option: Mix smoked paprika with olive oil for a deeper crust.
  • Citrus Lift: Add lemon zest to the herb-oil mixture.
  • Herb Swap: Try oregano and mint for a Mediterranean twist.

Storage & Reheating

  • Refrigerate: Store leftover lamb in an airtight container for 3–4 days.
  • Freeze: Slice, wrap tightly, freeze up to 2 months.
  • Reheat Gently: Warm in a covered dish with a splash of water or pan juices at 150°C / 300°F.
  • Avoid Microwaving: Can toughen meat; use low power if necessary.

Notes

  • Bring lamb to room temperature before cooking for even roasting.
  • Pat dry thoroughly to ensure a beautiful crust.
  • Generously rub with herb-oil and lamb rub mixture for maximum flavor.
  • Use a rack or vegetable bed to lift lamb above the water bath for perfect tenderness.

Nutrition

Serving: 1servingCalories: 354kcalCarbohydrates: 1gProtein: 43gFat: 19gSaturated Fat: 5gPolyunsaturated Fat: 2gMonounsaturated Fat: 11gCholesterol: 134mgSodium: 3631mgPotassium: 624mgFiber: 0.4gVitamin A: 94IUVitamin C: 2mgCalcium: 31mgIron: 4mg
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