Agnello al Forno (Oven Roasted Lamb with Potatoes)
Why this recipe works
- Layered pan juices: Lemon, garlic, rosemary, white wine and stock mingle with the lamb drippings to create a bright, savoury roasting sauce.
- One-pan efficiency: The potatoes cook around the lamb, taking on flavour from the meat and aromatics while reducing extra prep and washing up.
- Classic roast method: A hot start at 220°C (430°F) encourages browning before the oven is lowered to 170°C (340°F) for gentler, more even roasting.
Get the most out of this recipe
Timing notes
- Rest before carving: Let the lamb rest for 15 minutes so the juices settle and the meat carves more cleanly.
- Mostly hands-off: The active work is mainly seasoning the lamb and preparing the potatoes; most of the time is spent roasting.
- Serve after resting: Carve once rested and serve with the potatoes while the pan juices are still hot and glossy.
Ingredient notes
- Choose bone-in lamb: A bone-in leg gives the roast a traditional shape and helps keep the meat succulent during the longer cooking time.
- Use fresh rosemary if possible: Fresh rosemary gives a cleaner, more aromatic flavour than dried herbs and stands up well to roasting.
- Balance with lemon and wine: Lemon juice and dry white wine cut through the richness of the lamb and keep the pan juices lively.
Common mistakes
- Do not keep the oven too hot: After the initial browning stage, reduce the oven to 170°C (340°F) so the lamb roasts gently rather than drying at the edges.
- Keep an eye on the pan: If the tray looks dry, add a little more stock so the potatoes continue to baste in the juices.
- Avoid carving immediately: Skipping the rest can make the lamb lose more juices on the board and leave the slices less tender.
Make-ahead tips
- Prep the aromatics ahead: The garlic, rosemary and potatoes can be prepared in advance and kept covered in the fridge until ready to roast.
- Reheat gently: Warm leftovers in a 180°C (355°F) oven with a splash of stock until piping hot to help keep the lamb moist.
- Freeze with pan juices: Freeze carved lamb and potatoes with a little of the roasting juice to protect the texture when reheated.
Equipment you'll need
Ingredients
Instructions
- Heat the oven to 220°C (430°F). Put the lamb in a roasting pan and pat it dry; halve the lemon and squeeze the juice over the lamb, then add the olive oil and rub all over.
- Crush the peppercorns with a mortar and pestle (or the bottom of a saucepan). Strip the rosemary leaves from the sprigs and finely chop the leaves; season the lamb all over with the salt, crushed peppercorns and rosemary.
- Scrub the new potatoes and cut any larger ones in half so they cook evenly. Lightly crush the garlic cloves with the side of a knife, then scatter the potatoes and garlic around the lamb in the pan, turning them in the oily lemony juices.
- Roast for 20 minutes to start browning the lamb. Pour the white wine into the pan (avoid the lamb skin so you do not wash off the seasoning), then return to the oven.
- Reduce the oven to 170°C (340°F). Add the chicken stock to the pan, then roast for 60 to 75 minutes, turning the potatoes once or twice, until the lamb is tender and a thermometer reads about 60°C (140°F) for medium or 65°C (150°F) for medium-well.
- Lift the lamb onto a board and rest for 15 minutes. Spoon off any excess fat from the pan juices if you like, then carve the lamb and serve with the potatoes, garlic and the rosemary-scented juices.
Recipe notes
Tips
- If the pan looks dry at any point, add a small splash of chicken stock to keep the potatoes basting in the juices.
- For extra flavour, rub a little of the lemon zest into the salt before seasoning the lamb.
- Food safety: if serving vulnerable guests, cook the lamb to at least 70°C (160°F) and rest as directed.
Substitutions
- Replace Dry White Wine with the same amount of Chicken stock for an alcohol-free roast.
- Replace Fresh rosemary with the same amount of Fresh thyme for a softer, more floral herb note.
Storage
- Refrigerate up to 3 days
- Cool leftovers quickly, then refrigerate in a sealed container. Reheat in a 180°C (355°F) oven with a splash of chicken stock until piping hot; freeze carved lamb and potatoes with a little pan juice for best moisture.
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Recipe overview
- Servings: 4 servings
- Total time: 2h 5min (25min active)
- Difficulty: Medium
- Cuisine: Italian
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