Slow-Roasted Lamb Shoulder with Rosemary and Mint Jus

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

A tender, slow-cooked British lamb shoulder infused with rosemary and served with a fresh mint jus that highlights traditional UK flavors. This british-inspired lamb ready in about 260 minutes pairs bone-in lamb shoulder, fresh rosemary sprigs, garlic cloves 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: 240 min Serves 6 British cuisine 480 cal/serving
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Ingredients

Instructions

  1. Step 1: Preheat oven to 275°F. Pat dry 3 lbs bone-in lamb shoulder and rub with 3 tbsp olive oil, 1 tbsp sea salt, 1 tsp black pepper, and finely chopped 4 sprigs fresh rosemary and 6 minced garlic cloves. Place in a roasting pan.
  2. Step 2: Roast lamb uncovered for 4 hours, basting every hour with its own juices, until meat is tender and falling off the bone.
  3. Step 3: While lamb roasts, prepare mint jus by blending 1/2 cup fresh mint leaves with 2 cups beef stock, 2 tbsp red wine vinegar, and 1 tsp honey until smooth.
  4. Step 4: Strain the jus into a saucepan and simmer over medium heat for 10 minutes until slightly reduced and fragrant.
  5. Step 5: Remove lamb from oven, let rest for 15 minutes, then carve and serve drizzled with warm mint jus.

Frequently asked questions

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

Total time is about 260 minutes (20 min prep + 240 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 Shoulder with Rosemary and Mint 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 shoulder from drying out.

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

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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