Slow-Roasted Lamb with Garlic and Rosemary Jus

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Tender slow-roasted lamb leg infused with garlic and rosemary, served with a fragrant jus that enhances every bite. This mediterranean-inspired lamb ready in about 195 minutes pairs bone-in lamb leg, minced garlic cloves, fresh rosemary sprigs for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 480 calories and feeds 6, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 180 min Serves 6 Mediterranean cuisine 480 cal/serving
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Ingredients

Instructions

  1. Step 1: Preheat oven to 275°F. Rub 4 lbs bone-in lamb leg with 3 tbsp olive oil, 6 minced garlic cloves, 2 tsp kosher salt, and 1 tsp freshly ground black pepper, then tuck 4 fresh rosemary sprigs under the lamb’s skin.
  2. Step 2: Place the lamb on a roasting rack in a roasting pan and slow roast for 3 hours, until the internal temperature reaches 135°F for medium-rare.
  3. Step 3: Remove lamb from oven and tent loosely with foil to rest for 20 minutes while juices redistribute.
  4. Step 4: Meanwhile, pour off excess fat from the roasting pan and place the pan over medium heat. Add 1 cup red wine and 1 1/2 cups beef broth, scraping up browned bits with a wooden spoon.
  5. Step 5: Simmer the sauce until reduced by half and thickened, about 10 minutes, then whisk in 2 tbsp unsalted butter until glossy and smooth.
  6. Step 6: Slice the rested lamb and spoon the rosemary garlic jus over before serving.

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Frequently asked questions

How long does Slow-Roasted Lamb with Garlic and Rosemary Jus take to make?

Total time is about 195 minutes (15 min prep + 180 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Slow-Roasted Lamb with Garlic and Rosemary Jus?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep bone-in lamb leg from drying out.

Can I substitute ingredients in Slow-Roasted Lamb with Garlic and Rosemary Jus?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Slow-Roasted Lamb with Garlic and Rosemary Jus for a different number of people?

The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Slow-Roasted Lamb with Garlic and Rosemary Jus?

Mediterranean lamb like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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