Oven-Roasted British Lamb with Mint and Rosemary

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

Tender British lamb leg slow-roasted with fresh mint and rosemary, served with a rich pan gravy. This british-inspired lamb ready in about 125 minutes pairs British lamb leg, chopped fresh mint leaves, chopped 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.

Prep: 20 min Cook: 105 min Serves 6 British cuisine 480 cal/serving
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Ingredients

Instructions

  1. Step 1: Preheat the oven to 325°F. In a small bowl, combine 1/4 cup chopped fresh mint leaves, 3 chopped rosemary sprigs, 4 minced garlic cloves, 3 tbsp olive oil, 2 tsp sea salt, and 1 tsp black pepper to form a fragrant herb paste.
  2. Step 2: Rub the herb paste evenly all over the 3 lbs British lamb leg, ensuring the flavors penetrate the meat. Place the lamb on a roasting rack in a shallow pan.
  3. Step 3: Roast the lamb in the preheated oven for about 1 hour 45 minutes, or until the internal temperature reaches 135°F for medium-rare. Baste occasionally with pan juices.
  4. Step 4: Remove the lamb from the oven and transfer to a cutting board to rest for 15 minutes.
  5. Step 5: Meanwhile, place the roasting pan over medium heat and add 1 cup beef broth, scraping any browned bits from the pan. Simmer for 5 minutes until the sauce thickens slightly.
  6. Step 6: Slice the lamb and serve drizzled with the pan gravy, garnished with extra mint if desired.

Frequently asked questions

How long does Oven-Roasted British Lamb with Mint and Rosemary take to make?

Total time is about 125 minutes (20 min prep + 105 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 Oven-Roasted British Lamb with Mint and Rosemary?

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 british lamb leg from drying out.

Can I substitute ingredients in Oven-Roasted British Lamb with Mint and Rosemary?

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 Oven-Roasted British Lamb with Mint and Rosemary 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 Oven-Roasted British Lamb with Mint and Rosemary?

British 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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